JP6120534B2 - Method and apparatus for manufacturing fiber assembly - Google Patents

Description

  The present invention relates to a method and apparatus for manufacturing a fiber assembly.

  Fiber aggregates composed of fibers having a thin average fiber diameter are, for example, separators for electrochemical elements such as separators for alkaline batteries, separators for lithium batteries, separators for capacitors or separators for redox flow batteries, electrode materials for various electrochemical elements, Fuel cell and air battery components such as gas diffusion layer base materials, gas and liquid filtration materials, medical materials such as patch base materials and plaster base materials, clothing materials such as interlining, lotions, etc. It is useful for various industrial materials such as skin care sheets holding towels, sanitary products such as towels or diapers, cleaning products such as wiping materials and liquid absorbent sheets, and bioscience materials such as bioreactors and cell culture substrates. Are known.

Then, as a method for producing a fiber assembly composed of fibers having a thin average fiber diameter, a fiber assembly in which a spinning dope is discharged into a spinning space and fiberized by the action of an electric field, and the fibers are accumulated on a collecting surface of the collector 2. Description of the Related Art A method for manufacturing a body (hereinafter sometimes referred to as an electrostatic spinning method) is known.
For example, Japanese Patent Laid-Open No. 2005-264401 (hereinafter referred to as Patent Document 1) is characterized in that a gas having a desired relative humidity is supplied and only the periphery of the spinning dope supply unit is maintained at the desired relative humidity. A method for producing a fiber assembly using an electrospinning method is disclosed.
And since patent document 1 can supply the gas of desired relative humidity and can maintain only the spinning stock solution supply part periphery at desired relative humidity reliably, even if it is a case where it scales up, the influence of the environmental change by a season or the weather It is disclosed that the fiber can be produced without the fiber diameter varying from day to day.

Japanese Patent Laying-Open No. 2005-264401 (Claims, 0009, FIG. 1, etc.)

  Although the inventors have studied the production of a fiber assembly by using an electrospinning method as in the production method disclosed in Patent Document 1, it is impossible to produce a fiber assembly having desired physical properties. there were. The following were considered as the cause.

During the production of the fiber assembly, there was a case where the fiber was charged and started up on the surface of the fiber assembly (hereinafter sometimes referred to as fuzzing). Moreover, the fiber assembly containing many solvents and water | moisture contents may be manufactured.
And when the fiber assembly is manufactured under conditions that cause a lot of fuzz in the fiber assembly, or when the fiber assembly is manufactured under conditions where the amount of solvent or moisture contained in the manufactured fiber assembly is high However, it was difficult to produce a fiber assembly while maintaining a stable spinning state, and there was a tendency that a fiber assembly having the desired physical properties could not be produced. In the worst case, a fiber aggregate that is difficult to peel off from the collector and is inferior in handleability may be produced.

  The reason for this is that when there are fibers that are charged and rising in the spinning space, the electric field force acting on the spinning dope changes as the number of fibers increases, so the spinning conditions are thought to have changed unintentionally. It was. In addition, as the solvent and moisture contained in the fiber assembly increases, the electric field force acting on the spinning dope changes due to the change in the conductive performance of the fiber assembly, and the spinning conditions change unintentionally. it was thought.

  In particular, when the amount of spinning solution per unit time released from the spinning start portion (spinning amount) is large, the amount of fibers formed due to the unintentionally changed spinning conditions increases. There was a tendency that it was more difficult to produce a fiber assembly having the desired physical properties.

  Therefore, there is a need for a fiber assembly manufacturing method and manufacturing apparatus that can prevent unintentional changes in spinning conditions regardless of the amount of spinning.

The present invention
[1] “(1) supplying gas adjusted in temperature and humidity to the spinning space and moving the gas existing in the spinning space to the gas outlet through the collector,
(2) A step of discharging the spinning dope from the spinning start portion to the spinning space and fiberizing mainly by the action of an electric field,
(3) collecting the fibers on the collecting surface of the collecting body, and forming a fiber assembly on the collecting surface;
A method for producing a fiber assembly comprising:
The method for producing a fiber assembly, wherein the gas discharge port is present in close proximity to the back surface facing the collection surface , and the gas inflow ratio of the gas is greater than 1 . "
And
[2] “(1) An air supply device capable of supplying gas adjusted in temperature and humidity to the spinning space,
(2) An exhaust device provided with a gas outlet, which allows gas existing in the spinning space to pass through the collector and move to the gas outlet;
(3) Spinning start section capable of discharging the spinning dope into the spinning space;
(4) Electric field forming means capable of fiberizing the spinning dope discharged from the spinning start part mainly by the action of an electric field,
(5) A collecting body that accumulates the fibers on the collecting surface of the collecting body and can form a fiber assembly on the collecting surface;
An apparatus for producing a fiber assembly comprising:
The apparatus for manufacturing a fiber assembly, wherein the gas discharge port is close to a back surface facing the collection surface , and the gas inflow ratio of the gas is greater than 1 . "
It is.

  As a result of continuous investigations, the inventors of the present invention have supplied a gas whose temperature and humidity are adjusted to a spinning space and a gas that is present in the spinning space, in a fiber assembly manufacturing method using an electrostatic spinning method. It has been found that the spinning conditions can be prevented from unintentionally changing by passing through a gas discharge port that faces the back surface facing the collection surface and is close to the gas discharge port.

The reason for this is not fully clarified, but it is easy to prevent the atmosphere of the spinning space from changing by supplying a gas whose temperature and humidity are adjusted to the spinning space, and the production is accompanied by the change. It is conceivable that it is easy to prevent the amount of solvent and moisture contained in the fiber assembly to be increased.
Furthermore, the gas supplied to the spinning space is moved to the gas outlet through the collector by the gas outlet existing in close proximity to the back surface facing the collection surface. The gas force passing through the fiber assembly makes it easy to prevent the fibers from standing up, and prevents the spinning conditions from unintentionally changing due to the change in the electric field force acting on the spinning dope. It is considered possible.

  From the above, the method for producing a fiber assembly of the present invention can prevent unintentional changes in spinning conditions regardless of the amount of spinning.

  And since the manufacturing apparatus of the fiber assembly of this invention can implement the manufacturing method of the fiber assembly mentioned above, it can prevent that spinning conditions unintentionally change irrespective of the amount of spinning.

It is a typical side view of the manufacturing apparatus of a fiber assembly. It is a typical side view of the manufacturing apparatus of another fiber assembly.

  The fiber assembly manufacturing method of the present invention will be described with reference to FIG. 1 which is a schematic side view of a fiber assembly manufacturing apparatus.

  The fiber assembly production apparatus (100) of the present invention mainly discharges a spinning solution by supplying an air supply device (1) capable of supplying a gas whose temperature and humidity are adjusted from the gas supply port (2) into the case (3). Spinning start section (4) that can be applied, power supply (7) that can apply voltage to the spinning dope, ground (5) of power supply (7), collection body (8), collection surface of collection body (8) A gas discharge port (10) that faces and is close to the back surface (9b) facing (9a) is provided.

  In FIG. 1, since the collector (8) is grounded (6), an electric field is formed in the space between the spinning solution discharged from the spinning start section (4) and the collection surface (9a). And the space becomes the spinning space (11). Moreover, in FIG. 1, the apparatus which adjusts the temperature and humidity of the gas supplied with an air supply apparatus (1) is abbreviate | omitted and shown in figure.

  First, in the fiber assembly manufacturing apparatus (100) of the present invention, the gas whose temperature and humidity are adjusted by the action of the air supply device (1) is passed through the spinning space (in the case (3) from the gas supply port (2) ( 11). Next, the gas existing in the spinning space (11) is moved to the gas discharge port (10) through the collector (8) by the action of the exhaust device (12).

  A voltage is applied to the spinning dope by the action of the power supply (7), and an electric field is formed between the spinning dope and the collecting surface (9a) grounded (6).

  Next, the spinning dope is discharged from the spinning start section (4) into the spinning space (11), and the discharged spinning dope is mainly reduced in diameter and made into fibers by the action of an electric field. Then, the fibers are accumulated on the collecting surface (9a), and the fiber aggregate (13) is manufactured on the collecting surface (9a).

  While spinning is performed as described above, the gas existing in the spinning space (11) moves to the gas outlet (10) through the collector (8) by the action of the exhaust device (12). And then passes through the fiber assembly (13).

  The method and apparatus for producing a fiber assembly of the present invention makes it easy to prevent the atmosphere of the spinning space (11) from changing by supplying a gas whose temperature and humidity are adjusted to the spinning space (11). In addition, it is conceivable that it is easy to prevent the amount of the solvent and moisture contained in the fiber assembly (13) produced with the change from increasing.

  Furthermore, the gas supplied to the spinning space (11) passes through the fiber assembly (13) and moves to the gas discharge port (10). At that time, the gas passing through the fiber assembly (13) It is considered that it is possible to easily prevent the fibers from standing up by the force, and to prevent unintentional changes in the spinning conditions due to the change in the electric field force acting on the spinning dope.

  From the above, the production method and production method of the fiber assembly of the present invention can prevent unintentional changes in the spinning conditions regardless of the amount of spinning.

  Hereinafter, details of the present invention will be described.

In the present invention, the kind of gas supplied to the spinning space (11) is appropriately selected so that a fiber assembly (13) having desired physical properties can be produced. For example, air, oxygen, nitrogen, carbon dioxide, rare gas These can be prepared singly or in combination. Note that air is preferably used from the viewpoint of convenience.
A method for adjusting the temperature and humidity of the gas is selected as appropriate, but a generally available temperature and humidity adjusting device can be used.
In addition, although the temperature and humidity of the gas used by this invention are suitably adjusted so that a fiber assembly (13) provided with the target physical property can be manufactured, it is preferable that temperature is 0 to 200 degreeC, for example, It is more preferably 10 ° C to 100 ° C, and most preferably 15 ° C to 30 ° C. Further, the humidity can be adjusted within the range of 0% to 100%, preferably 5% to 70%, more preferably 5% to 50%. Moreover, since there is a tendency for the fiber aggregate (13) having the desired physical properties to be easily manufactured as the fluctuation range of the temperature and humidity of the adjusted gas is small, the fluctuation range of the gas temperature is ± 1 ° C./hour or less. It is preferable that the fluctuation range of humidity is adjusted to be ± 5 RH% / hour or less.

Although the kind of air supply apparatus (1) is selected suitably, the gas pump provided with the flowmeter, the cylinder which can discharge | release compressed gas, etc. can be used, for example.
In addition, since the volume of the gas which adjusted the temperature and humidity currently supplied from the gas exhaust port (10) changes with the width of the spinning space (11) etc., the fiber assembly (13) provided with the target physical property, for example. ) Is appropriately selected so as to be manufactured.

The position of the gas supply port (2) provided in the spinning space (11) is adjusted as appropriate so that a fiber assembly (13) having the desired physical properties can be produced. The temperature supplied from the gas supply port (2) and The gas supply port (2) is provided on the upper side of the drawing in FIG. 1 with respect to the spinning start portion (4) so that the humidity-adjusted gas can be supplied to the entire spinning space (11). preferable.
The number of gas supply ports (2) is adjusted as appropriate, and a plurality of gas supply ports (2) may be provided.

  Furthermore, as disclosed in Patent Document 1, for example, the temperature and the temperature from the gas supply port (2) through a porous material (not shown) such as a metal or resin punching plate, cloth, or non-woven fabric. A gas with adjusted humidity may be supplied. The presence of the porous material is preferable because it prevents the supply of a gas whose temperature and humidity are adjusted from occurring locally.

The present invention is characterized in that the gas discharge port (10) faces and is close to the back surface (9b).
Here, the gas discharge port (10) facing the back surface (9b) means that the gas discharge port (10) and the back surface (9b) are substantially parallel or parallel to each other. The term “having” means that the shortest distance between the gas discharge port (10) and the back surface (9b) is 30 cm or less.

Since the gas discharge port (10) exists close to and faces the back surface (9b), the gas with adjusted temperature and humidity supplied to the spinning space (11) can easily pass through the fiber assembly (13). Thus, it is possible to easily prevent the fibers from rising by the force of the gas passing through the fiber assembly (13).
In order to effectively exhibit the above-described effects, the distance between the gas outlet (10) and the back surface (9b) is preferably 20 cm or less, more preferably 10 cm or less, ideally As shown in FIG. 1, it is most preferably 0 cm (a state where the gas outlet (10) and the back surface (9b) are in contact).

  The volume of gas passing through the gas discharge port (10) (for example, the volume of gas suctioned from the gas discharge port (10) by the action of the exhaust device (12)) is the gas present in the spinning space (11), It adjusts so that a collection body (8) may be passed and can move to a gas discharge port (10), and it selects suitably so that the fiber assembly (13) provided with the target physical property can be manufactured.

  At this time, the fiber assembly under the condition that the volume (A) of the gas adjusted in temperature and humidity supplied from the gas supply port (2) is equal to or larger than the volume (B) of the gas passing through the gas discharge port (10). When the body (13) is manufactured, a gas whose temperature and humidity are not adjusted from a gap between various devices and the case (3) or another gas discharge port (21 in FIG. 2) described later to the spinning space (11). Inflow can be prevented, it is easy to prevent the atmosphere of the spinning space (11) from changing, fluffing is prevented, and / or a fiber assembly containing a large amount of solvent and moisture is produced. It is preferable that the spinning conditions can be prevented from changing unintentionally.

Further, the ratio of the gas volume (A) to the gas volume (B) (hereinafter referred to as a gas inflow / outflow ratio) is preferably larger than 1 so that the above-described effect can be reliably exhibited. Specifically, it is more preferably 1.1 or more, and most preferably 1.5 or more. The upper limit of the gas inflow / outflow ratio is appropriately adjusted, but is preferably 200 or less, more preferably 50 or less, but preferably 10 or less in terms of energy efficiency. The gas inflow / outflow ratio can be calculated from the following equation.

Gas inflow / outflow ratio = A / B
A: Volume of gas (L / min) supplied from the gas supply port with adjusted temperature and humidity
B: Volume of gas passing through gas outlet (L / min)

In addition, when manufacturing a fiber assembly (13) on the conditions whose gas inflow / outflow ratio is larger than 1, spinning space (11) so that gas can be discharged | emitted out of case (3) (outside of spinning space (11)). It is preferable to provide another gas discharge port (21 in FIG. 2), which will be described later, in the case (3) that surrounds.

  As the spinning dope, for example, a molten polymer obtained by melting an organic polymer or an inorganic polymer, or a polymer solution obtained by dissolving an organic polymer or an inorganic polymer in a solvent can be used. Alternatively, a solution in which a monomer compound or oligomer compound capable of forming an inorganic polymer is dissolved in a solvent can be used.

  The kind of organic polymer or inorganic polymer constituting the spinning dope is not particularly limited as long as it can be spun in the present invention. For example, polyolefin resin (polyethylene, polypropylene, polymethylpentene, etc.), styrene Resin, polyvinyl alcohol resin, polyether resin (polyether ether ketone, polyacetal, modified polyphenylene ether, aromatic polyether ketone, etc.), polyester resin (polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate) Phthalate, polybutylene naphthalate, polycarbonate, polyarylate, wholly aromatic polyester resin, etc.), polyimide resin, polyamideimide resin, polyamide resin (for example) , Aromatic polyamide resins, aromatic polyetheramide resins, nylon resins, etc.), acrylic resins, nitrile group-containing resins (eg, polyacrylonitrile), urethane resins, epoxy resins, polysulfone resins (polysulfone, Polyethersulfone, etc.), fluorine-based resins (polytetrafluoroethylene, polyvinylidene fluoride, etc.), cellulose-based resins, polybenzimidazole resins, and other known organic polymers, or metal alkoxides (silicon, aluminum, titanium, zirconium, boron) In addition, a polymer obtained by polymerizing a known inorganic compound such as an inorganic polymer obtained by polymerizing methoxide such as tin and zinc, ethoxide, propoxide, butoxide and the like) can be used.

  These polymers may be either a linear polymer or a branched polymer, the polymer may be a block copolymer or a random copolymer, and the polymer has any three-dimensional structure or crystallinity. Even a thing is not specifically limited.

  In addition, polymers other than those exemplified above can be used, and a spinning dope comprising two or more polymers including resins other than those exemplified can also be used.

  In addition, when the component constituting the spinning dope is a monomer compound or an oligomer compound capable of forming an inorganic polymer, the type thereof is not particularly limited as long as it can be spun in the present invention, but as the compound For example, metal organic compounds such as metal alkoxides, metal acetylacetonates, acetates, and oxalates can be used singly or in combination.

  When the above-mentioned organic polymer, inorganic polymer, or monomer compound or oligomer compound capable of forming an inorganic polymer is dissolved in a solvent, the solvent varies depending on the spinning conditions and is not particularly limited. For example, water, acetone , Methanol, ethanol, propanol, isopropanol, tetrahydrofuran, dimethyl sulfoxide, 1,4-dioxane, pyridine, N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, acetonitrile, formic acid, toluene, Examples include benzene, cyclohexane, cyclohexanone, carbon tetrachloride, methylene chloride, chloroform, trichloroethane, ethylene carbonate, diethyl carbonate, propylene carbonate, and the like. Solvents other than those exemplified can also be used, and mixed solvents in which two or more solvents are mixed, including solvents other than those exemplified, can also be used.

  The concentration of the monomer compound or oligomer compound capable of forming an organic polymer, an inorganic polymer, or an inorganic polymer in the spinning dope is also appropriately adjusted depending on the spinning conditions.

  The concentration of the polymer in the polymer solution is appropriately adjusted so that a fiber assembly (13) having the desired physical properties can be produced. The concentration (percentage of the dissolved polymer in the mass of the spinning dope) The concentration is preferably 0.1% by mass to 90% by mass, since it tends to be difficult to perform spinning if the content is too thick or too thin, and 0.5% by mass to 50% by mass. It is more preferable that it is 1% by mass to 30% by mass.

  In addition, the spinning dope is, for example, antibacterial agent particles, antiviral agent particles, antifungal agent particles, photocatalyst particles, deodorizing particles, dye particles, flame retardant particles, insecticide particles, disinfectant particles, and fragrance particles. Further, conductive particles or the like may be mixed.

  In the fiber assembly production method and production apparatus (100) of the present invention, when a fiber assembly (13) is produced using a spinning stock solution with improved conductivity, the desired physical properties can be obtained even under spinning conditions in which the amount of spinning is increased. There exists a tendency which becomes easy to manufacture the fiber assembly (13) provided, and it is preferable. The reason for this is not completely clear, but by improving the conductivity of the spinning dope, it becomes easier to prevent the spinning conditions from unintentionally changing due to the action of the electric field acting on the spinning dope efficiently. It is considered that a fiber assembly (13) having desired physical properties can be produced.

  As the spinning stock solution with improved conductivity, for example, a spinning stock solution containing a conductive polymer and / or a conductive solvent, a spinning stock solution imparted with conductivity by dissolving or melting a salt, and conductive particles are included. Examples include a spinning dope.

Examples of salts that can be used to improve the conductivity of the spinning dope include, for example, metal salts such as lithium chloride, halogen salts such as halogen salts of organic quaternary ammonium, ammonium acetate, ammonium formate, and ammonium oxalate. Examples include organic salts. The percentage of the mass of the salt in the mass of the spinning dope is appropriately adjusted, but is preferably 0.001% by mass to 90% by mass.
The salt described above may be completely dissolved or melted in the spinning dope, or may be in a solid state in the spinning dope.

  Examples of the conductive particles that can be used to prepare the spinning dope include carbon black, boron-modified carbon black, carbon nanotubes, carbon nanofibers, metal particles, and metal oxide particles. The percentage of the conductive particles in the mass of the spinning dope is appropriately adjusted. However, if the percentage is too high, the fiberization of the spinning dope tends to be inhibited, so that it is 90% by mass or less. Preferably, it is 80% by mass or less, and most preferably 70% by mass or less. Further, when the percentage is low, it is difficult to obtain the effect of improving the electrical conductivity of the spinning dope, so it is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, Most preferably, it is 1 mass% or more.

  And although the average particle diameter of electroconductive particle is adjusted suitably, it manufactures the fiber aggregate (13) with a uniform fiber shape while preventing a conductive particle from dropping from the manufactured fiber aggregate (13). The average particle diameter of the conductive particles is preferably 10 μm or less, more preferably 1 μm or less, and most preferably 0.1 μm or less. Further, the lower limit of the average particle diameter is appropriately prepared, but in practice, it is preferably 0.001 μm or more.

In the present invention, the average particle diameter represents the number average particle diameter of solid particles obtained from a particle size distribution meter by a dynamic light scattering method. For example, a state called an aggregate or structure such as carbon black is used. When determining the average particle size of particles that can be formed, the above-mentioned dynamic light scattering method tends to prevent the average particle size from being measured accurately.
Therefore, when determining the average particle diameter of particles that can form a state called an aggregate or structure, an electron micrograph of the particles is taken, and the diameter of each particle in the 50 particles in the electron micrograph is taken. Obtained by calculating the average value. When the shape of the particle shown in the electron micrograph is non-circular, the diameter of a circle having the same area as the particle of the shape shown in the electron micrograph is regarded as the particle diameter.

  The spinning start part (4) refers to a member that can release the spinning dope, and the type and shape of the spinning start part (4) are appropriately adjusted so that a fiber assembly (13) having the desired physical properties can be produced. A member provided with a nozzle, a slit, or the like can be used. Further, the number of spinning start portions (4) provided in the fiber assembly production apparatus (100) is also adjusted as appropriate so that a fiber assembly (13) having desired physical properties can be produced. For example, as disclosed in Japanese Patent Application Laid-Open No. 2006-112023, it is possible to provide a plurality of spinning start portions (4) that move along an endless track that can circulate.

  Further, when the spinning start portion (4) has conductivity such as metal, the voltage is applied to the spinning dope by applying a voltage to the spinning start portion (4) as shown in FIG. Can do.

  The method for forming the electric field is adjusted as appropriate, but a method of forming a potential difference between the charged spinning solution and the grounded counter electrode by applying a voltage to the spinning solution with the power supply (7) is adopted. Can do. The polarity of the voltage applied to the spinning dope may be positive or negative, and is adjusted as appropriate so that a fiber assembly (13) having desired physical properties can be produced.

  When the collector (8) described later has conductivity such as metal, the counter electrode can be formed by grounding the collector (8) as shown in FIG. Moreover, when the collector (8) does not have conductivity, a counter electrode (not shown) separately grounded may be provided on the back surface (9b) side of the collector (8).

  In the above description, the voltage supply is applied to the spinning dope by the power supply (7). However, the spinning dope may be grounded and the voltage may be applied to the counter electrode by the power supply (7). Alternatively, a voltage may be applied to the spinning solution and the counter electrode by the power supply (7) so that a potential difference is formed between the spinning solution and the counter electrode.

  The potential difference between the spinning solution and the counter electrode is adjusted as appropriate so that a fiber assembly (13) having desired physical properties can be produced. If the potential difference is too large, the potential difference between the counter electrode and the spinning start section (4) is adjusted. There is a risk that spinning may not be possible due to dielectric breakdown between members such as the gap, and if the potential difference is too small, the spinning stock solution tends to become difficult to fiberize, so the potential difference is 0.1 to 10 kV / cm. And is most preferably 0.1 to 5 kV / cm.

  In addition, when applying a voltage to the spinning start portion (4), the distance between the spinning start portion (4) and the counter electrode is appropriately adjusted so that a fiber assembly (13) having desired physical properties can be produced. If the distance is too long, the action of the electric field is weak and the spinning dope tends to be difficult to fiberize. Therefore, the distance is preferably 100 cm or less, more preferably 80 cm or less, and 50 cm or less. Is most preferred. In addition, if the distance is too short, there is a risk that dielectric breakdown may occur between members such as between the spinning start portion (4) and the counter electrode, and spinning may not be possible. Therefore, the distance is 1 cm or more. preferable.

In the present invention, “mainly fiberizing by the action of an electric field” means that the force necessary for fiberizing the spinning solution discharged from the spinning start portion (4) into the spinning space (11) is the action of the electric field. It means that there is.
The spinning solution discharged from the spinning start section (4) to the spinning space (11) has an action of gravity, a gas flow adjusted in temperature and humidity supplied from the gas supply port (2), and the like. Even when force is acting, if the force does not show an effect that greatly changes the traveling direction and speed of the spinning dope, or an effect that greatly changes the degree of fiberization Is not included, it is included in the range in which the spinning dope is fiberized mainly by the action of an electric field.

Since the fiber assembly production method and production apparatus (100) of the present invention can be “fibrated mainly by the action of an electric field”, it prevents an excessive force from acting on the spinning dope, and the spinning conditions are not intended. Since the causes that can be changed can be reduced, it is easy to prevent unintentional changes in the spinning conditions, and it is easy to produce a fiber assembly (13) having the desired physical properties.
Therefore, in order to avoid an excessive force other than the action of the electric field from acting on the spinning dope discharged from the spinning start part (4) to the spinning space (11), the spinning space (11) from the spinning start part (4) is avoided. The force (for example, gas flow, liquid flow, and centrifugal force) that shows an action that greatly changes the traveling direction and speed of the spinning stock solution released to), or an action that greatly changes the degree of fiberization. The fiber assembly (13) is produced without applying a force such as a force to the spinning dope discharged from the spinning start section (4) to the spinning space (11).

  As the collector (8), for example, a net, a porous film, or a fabric (for example, a nonwoven fabric, a woven fabric, a knitted fabric) or the like is breathable so that a gas with adjusted temperature and humidity supplied to the spinning space (11) can pass through. Use porous material.

  Moreover, although the aspect which uses the plate-shaped member as a collection body (8) is illustrated in FIG. 1, breathable porous body so that a fiber assembly (13) can be manufactured continuously. You may use the collection body (8) which can convey a fiber assembly (13), such as a belt conveyor which consists of. In addition, the conveyance speed of the fiber assembly (13) by a collection body (8) is suitably adjusted so that the fiber assembly (13) provided with the target physical property can be manufactured.

  And when preparing the laminated body of a fiber assembly (13) and another raw material (for example, a net | network, a porous film, or a cloth), other raw materials are used by using the said raw material as a collection body (8). The laminated body may be prepared by accumulating fibers.

  The distance between the spinning start part (4) and the collection surface (9a) is adjusted as appropriate so that a fiber assembly (13) having the desired physical properties can be produced. The distance is 100 cm or less. It is preferably 80 cm or less, and most preferably 50 cm or less. Moreover, it is realistic and preferable that the lower limit of the distance is 1 cm or more.

  Moreover, when the collection body (8) can convey the fiber assembly (13), the fiber assembly (13) such as a rotating roller is wound around the end of the fiber assembly (13) in the conveyance direction. Apparatus (not shown) capable of performing post-processing of the fiber assembly (13) such as heat treatment, cooling treatment, plasma treatment, sulfonation treatment, surface modification treatment such as fluorine treatment, charging treatment, etc. (Not shown) or an apparatus (not shown) for laminating with a separately prepared material may be provided.

  A modified example of the fiber assembly manufacturing method and manufacturing apparatus (100) of the present invention described above will be described with reference to FIG. 2 which is a schematic side view of another fiber assembly manufacturing apparatus.

  In addition to the configuration of the above-described fiber assembly manufacturing apparatus (100), the other fiber assembly manufacturing apparatus (200) includes a collector (10) in a direction from the spinning start portion (4) toward the collector (8). ) Is provided with another gas outlet (21) at a position away from the gas outlet (10) from the back surface (9b) (in other words, near the end of the case (3)). To do.

In another apparatus for manufacturing a fiber assembly (200), the gas in the case (3) can be discharged outside the case (3) (outside the spinning space (11)) via another gas discharge port (21). Therefore, since it becomes easy to manufacture the fiber assembly (13) under the condition where the gas inflow / outflow ratio is larger than 1, it is ensured that the gas whose temperature and humidity are not adjusted flows into the spinning space (11). Can be prevented.
In addition, the volume of the gas discharged | emitted out of case (3) from another gas discharge port (21) is adjusted suitably so that the fiber assembly (13) provided with the target physical property can be manufactured.

  The method of discharging the gas from the other gas discharge port (21) to the outside of the case (3) is appropriately selected. For example, as shown in FIG. A method of providing a notch portion, a method of exhausting gas from another gas exhaust port (21) to the outside of the case (3) by operation of an exhaust device (not shown) provided separately, and the like can be adopted. Moreover, the number of another gas supply port (21) is adjusted suitably, and you may provide multiple.

  Further, as disclosed in Patent Document 1, for example, a gas is separated from another gas discharge port (21 through a porous material (not shown) such as a metal or resin punching plate, cloth, nonwoven fabric, or the like. ) To the outside of the frame (3) is preferable because it is possible to prevent the occurrence of exhaust locally due to the presence of the porous material.

  EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but these do not limit the scope of the present invention.

(Evaluation method for the presence or absence of fuzz)
During the production of the fiber assembly, the surface of the fiber assembly was visually confirmed to evaluate whether fuzz occurred on the surface of the fiber assembly.
That is, when the fluffing is not recognized on the main surface of the fiber assembly, a circle mark is described. When a lot of fuzz was observed on the main surface, a cross was marked.

(Measurement method of basis weight)
The mass (unit: g) of the fiber assembly was measured, and the value converted into the mass per 1 m ² when the measured mass was viewed from the side having the wide area (main surface) in the fiber assembly The basis weight (unit: g / m ² ) was used.

(Measurement method of solvent and moisture contained in fiber assembly)
By substituting each measured basis weight into the following equation, the percentage (%) of the solvent and moisture contained in the fiber assembly was calculated.
A = {(BC) / C} × 100
A: Percentage of solvent and water contained in fiber assembly (%)
B: Fabric weight (g / m ² ) immediately after being peeled off from the collecting surface of the stainless mesh (before drying)
C: The basis weight of the fiber assembly after drying (g / m ² )

(Preparation of spinning dope A)
Polyacrylonitrile (PAN) having a weight average molecular weight of 200,000 was dissolved in N, N-dimethylformamide (DMF) so as to have a mass ratio (PAN: DMF = 16% by mass: 84% by mass). A 16% by mass spinning dope A was prepared.

(Preparation of spinning dope B)
A vinylidene fluoride / tetrafluoroethylene / hexafluoropropylene copolymer (manufactured by Daikin Industries, Ltd., product name: VT-470) and a mass ratio of DMF (the copolymer: DMF = 10% by mass: 90% by mass) Thus, a solution having a copolymer concentration of 10% by mass was obtained.
Next, carbon black (Denka Black (registered trademark) granular product, average particle size: 35 nm) manufactured by Denki Kagaku Kogyo Co., Ltd. is mixed as the conductive particles into the above solution, and further diluted with DMF to disperse the carbon black. A spinning dope B was prepared.
The mass ratio of carbon black and the copolymer contained in the spinning dope B is (carbon black: the copolymer = 40% by mass: 60% by mass), and the concentration of the spinning dope B is 12% by mass. (Total of carbon black and the copolymer: DMF = 12% by mass: 88% by mass).

(Preparation of manufacturing equipment)
A manufacturing apparatus as shown in FIG. 2 was prepared.
That is, a metal nozzle having an inner diameter of 0.33 mm that can discharge the spinning stock solution was fixed in a space (vertical: 1000 mm, horizontal: 1000 mm, height: 1000 mm) surrounded by the case. The DC high voltage generator was connected to a metal nozzle so that a voltage could be applied to the spinning dope.
Next, a stainless mesh was prepared as a collector and grounded. And the earthed stainless steel mesh was installed in the downward direction on the paper surface in FIG. 2 rather than the metal nozzle.
Further, a gas supply port was provided on the upper side on the paper surface in FIG. 2 from the metal nozzle, which can supply air adjusted in temperature and humidity by a gas pump to the spinning space.
Moreover, it faces and is close to the back surface (surface of the stainless steel mesh on the lower side of the paper in FIG. 2) opposite to the stainless steel mesh collection surface (surface of the stainless steel mesh on the upper side of the paper in FIG. 2). Thus, a suction port of the suction device was provided as a gas discharge port. The back surface of the stainless steel mesh and the suction port face each other in parallel, and the back surface of the stainless steel mesh and the suction port are in contact with each other. Also, the gas sucked from the suction port was discharged out of the case.
Further, in the direction from the nozzle toward the stainless steel mesh in the case, a notch was provided at a position farther from the suction port (a position on the lower side of the drawing in FIG. 2 than the suction port). The notch could serve as another gas outlet for discharging gas out of the case.

  Using the spinning dope A, a fiber assembly was produced under the conditions of Examples 1-5 and Comparative Example 1-2 below.

Example 1
Under the following conditions, a fiber assembly was produced on the collecting surface of the stainless mesh.
・ Distance between tip of metal nozzle and stainless steel mesh: 8cm
-Voltage applied to the spinning dope: 17 kV
-Temperature and humidity of air supplied from the gas supply port: Temperature 25 ° C, humidity 40% RH
・ Volume of air adjusted from temperature and humidity supplied from gas supply port: 10 L / second ・ Volume of air sucked from suction port: 10 L / second ・ Gas inflow / outflow ratio: 1
・ Volume of air exhausted from the notch through the case: 0 L / sec ・ Type of stock solution: Spin stock solution A
-Mass of the spinning dope discharged from the metal nozzle (spinning amount): 2 g / hour

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (weight per unit area before drying) was 10.10 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 10.00 g / m ² .

(Example 2)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 1 except that the spinning conditions were changed as follows.
-Volume of air supplied from the gas supply port with adjusted temperature and humidity: 11 L / second-Volume of air sucked from the suction port: 10 L / second-Gas inflow / outflow ratio: 1.1
・ Volume of air discharged from the notch to the outside of the case: 1 L / second

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 15.15 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

(Example 3)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 1 except that the spinning conditions were changed as follows.
-Volume of air adjusted from temperature and humidity supplied from the gas supply port: 15 L / second-Volume of air sucked from the suction port: 10 L / second-Gas inflow / outflow ratio: 1.5
-Volume of air discharged from the notch to the outside of the case: 5 L / second

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 15.30 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

Example 4
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 1 except that the spinning conditions were changed as follows.
-Volume of air adjusted from temperature and humidity supplied from the gas supply port: 9 L / second-Volume of air sucked from the suction port: 10 L / second-Gas inflow / outflow ratio: 0.9
-Volume of air discharged from the notch to the outside of the case: 0 L / second

In addition, during the production of the fiber assembly, the fiber assembly was able to be produced even though some fiber fluff was generated on the surface of the fiber assembly.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 15.30 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

(Example 5)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 1 except that the spinning conditions were changed as follows.
-Mass of spinning dope discharged from metal nozzle (spinning amount): 10 g / hour

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 15.15 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

(Comparative Example 1)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 1 except that air whose temperature and humidity were not adjusted was supplied from the gas supply port.
During the production of the fiber assembly, there were many fluffs on the surface of the fiber assembly, and the fiber assembly could not be produced while maintaining a stable spinning state.
Next, although the fiber assembly produced on the stainless steel mesh collecting surface was tried to be peeled off from the stainless mesh, the fiber assembly was poor in handling, so it could not be peeled off from the stainless mesh and measured the basis weight. And it was not able to use for the various measuring methods mentioned later.

(Comparative Example 2)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 1 except that the spinning conditions were changed as follows.
-Volume of air supplied from the gas supply port with adjusted temperature and humidity: 10 L / second-Volume of air sucked from the suction port: 0 L / second-Volume of air discharged from the notch out of the case: 10 L / second Second

During the production of the fiber assembly, there were many fluffs on the surface of the fiber assembly, and the fiber assembly could not be produced while maintaining a stable spinning state.

Next, although the fiber assembly produced on the stainless steel mesh collecting surface was tried to be peeled off from the stainless mesh, the fiber assembly was poor in handling, so it could not be peeled off from the stainless mesh and measured the basis weight. And it was not able to use for the various measuring methods mentioned later.

Subsequently, a fiber assembly was produced using the spinning dope B under the conditions of Examples 6-11 and Comparative Example 3-4 below.

(Example 6)
Under the following conditions, a fiber assembly was produced on the collecting surface of the stainless mesh.
・ Distance between tip of metal nozzle and stainless steel mesh: 15cm
・ Voltage applied to the spinning dope: 12 kV
-Temperature and humidity of air supplied from the gas supply port: Temperature 25 ° C, humidity 40% RH
・ Volume of air adjusted from temperature and humidity supplied from gas supply port: 10 L / second ・ Volume of air sucked from suction port: 10 L / second ・ Gas inflow / outflow ratio: 1
・ Volume of air exhausted from the notch through the case: 0 L / sec ・ Type of stock solution: Spin stock solution B
-Mass of the spinning dope discharged from the metal nozzle (spinning amount): 2 g / hour

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. At this time, the basis weight (weight per unit area before drying) of the fiber aggregate was 11.22 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 11.00 g / m ² .

(Example 7)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 6 except that the spinning conditions were changed as follows.
・ Distance between tip of metal nozzle and stainless steel mesh: 20cm
・ Voltage applied to the spinning dope: 15 kV
-Mass of spinning dope discharged from metal nozzle (spinning amount): 10 g / hour

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 15.30 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

(Example 8)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 6 except that the spinning conditions were changed as follows.
-Mass of the spinning dope discharged from the metal nozzle: 30 g / hour

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 15.15 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

Example 9
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 8 except that the spinning conditions were changed as follows.
-Volume of air supplied from the gas supply port with adjusted temperature and humidity: 11 L / second-Volume of air sucked from the suction port: 10 L / second-Gas inflow / outflow ratio: 1.1
・ Volume of air discharged from the notch to the outside of the case: 1 L / second

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 15.30 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

(Example 10)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 8 except that the spinning conditions were changed as follows.
-Volume of air adjusted from temperature and humidity supplied from the gas supply port: 15 L / second-Volume of air sucked from the suction port: 10 L / second-Gas inflow / outflow ratio: 1.5
-Volume of air discharged from the notch to the outside of the case: 5 L / second

During the production of the fiber assembly, no fuzz was observed on the surface of the fiber assembly, and the fiber assembly could be produced while maintaining a stable spinning state.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 15.30 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

(Example 11)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 8 except that the spinning conditions were changed as follows.
-Volume of air adjusted from temperature and humidity supplied from the gas supply port: 9 L / second-Volume of air sucked from the suction port: 10 L / second-Gas inflow / outflow ratio: 0.9
-Volume of air discharged from the notch to the outside of the case: 0 L / second

In addition, during the production of the fiber assembly, the fiber assembly was able to be produced even though some fiber fluff was generated on the surface of the fiber assembly.
Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 19.50 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

(Comparative Example 3)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 6 except that air whose temperature and humidity were not adjusted was supplied from the gas supply port.
During the production of the fiber assembly, there were a large number of fibers rising on the surface of the fiber assembly, and the fiber assembly could not be produced while maintaining a stable spinning state.

Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 24.00 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 15.00 g / m ² .

(Comparative Example 4)
A fiber assembly was produced on the collecting surface of the stainless mesh in the same manner as in Example 6 except that the spinning conditions were changed as follows.
-Volume of air supplied from the gas supply port with adjusted temperature and humidity: 10 L / second-Volume of air sucked from the suction port: 0 L / second-Volume of air discharged from the notch out of the case: 10 L / second Second

During the production of the fiber assembly, there were a large number of fibers rising on the surface of the fiber assembly, and the fiber assembly could not be produced while maintaining a stable spinning state.

Next, the fiber aggregate produced on the collecting surface of the stainless mesh was peeled off from the stainless mesh and the basis weight was measured. The basis weight of the fiber assembly at this time (basis weight before drying) was 29.70 g / m ² .
Thereafter, the peeled fiber assembly was subjected to a dryer apparatus adjusted to 60 ° C. for 30 minutes, thereby removing the solvent and moisture from the fiber assembly and drying it. The basis weight of the fiber assembly after drying was 18.00 g / m ² .

  The dried fiber aggregates produced in Examples and Comparative Examples were subjected to various methods described below to evaluate various physical properties of the fiber aggregates, and are summarized in Tables 1 and 2.

(Thickness measurement method)
The fiber assembly was subjected to a thickness measuring instrument (manufactured by Mitutoyo Corporation, code No. 547-401, measuring force: 3.5 N or less), and the arithmetic average value of the measured thicknesses of 10 points was defined as the thickness.

(Measurement method of porosity)
The porosity (unit:%) in the present invention was calculated from the following formula.
P = 100- (Fr1 + Fr2 + .. + Frn)
Here, Frn indicates the filling rate (unit:%) of the component n (for example, polymer, conductive particles, etc.) constituting the fiber assembly, and is a value obtained from the following formula.
Frn = [(M / T) × Prn / SGn] × 100
Here, M is the basis weight of the fiber assembly (unit: g / m ² ), T is the thickness of the fiber assembly (unit: cm), and Prn is the mass ratio of the component n constituting the fiber assembly (unit: Mass%) and SGn mean the density (unit: g / cm ³ ) of component n, respectively.

(Measurement method of average fiber diameter)
The average fiber diameter was calculated | required by measuring the electron micrograph of a fiber assembly and calculating the arithmetic mean value of the fiber diameter in 40 points | pieces selected at random.
The “fiber diameter” means the diameter in the cross section of the fiber including the exposed particles when the selected fiber is only a fiber in which particles such as conductive particles are exposed. In addition, when the selected fiber does not include a fiber in which the particle is exposed, or includes a fiber having a portion where the particle is not exposed even if the fiber includes the fiber in which the particle is exposed, The diameter in the fiber cross section of the part which the particle | grains in a fiber are not exposed is meant.

In Tables 1 and 2, “mass of spinning solution discharged from metal nozzle” is described as “spinning amount”, and “percentage of solvent and water contained in fiber assembly” is described as “percentage”. ing.

  From the result of comparing Example 1 with Comparative Example 1-2 and the result of comparing Example 6 with Comparative Example 3-4, the method for producing a fiber assembly according to the present invention is a gas with adjusted temperature and humidity. Is supplied to the spinning space, and the gas existing in the spinning space is allowed to pass through the collecting body and is moved to the gas outlet that faces and is close to the back surface facing the collecting surface. It has been found that it is possible to produce a fiber aggregate containing a small amount of solvent and moisture by preventing the occurrence of fuzz on the surface of the aggregate.

Furthermore, the following were found from the results of the examples.
From Example 1 and Example 5 and Example 6-8, the fiber assembly production method of the present invention generates fuzz on the surface of the fiber assembly even when the amount of spinning is increased. It was found that a fiber assembly containing a small amount of solvent and moisture can be produced.
-From the result of comparing Example 1-3 with Reference Example 1 and the result of comparing Example 8-10 with Reference Example 2 , fluffing occurs by adjusting the gas inflow / outflow ratio to 1 or more. It has been found that it is possible to prevent the production and / or to prevent the production of a fiber assembly containing a large amount of a solvent and moisture.

  From the above, the method and apparatus for producing a fiber assembly of the present invention can prevent unintentional changes in spinning conditions regardless of the amount of spinning.

  The method and apparatus for producing a fiber assembly of the present invention include, for example, separators for electrochemical elements such as separators for alkaline batteries, separators for lithium batteries, separators for capacitors or separators for redox flow batteries, and the electrode materials for electrochemical elements. , Fuel cell and air battery components such as gas diffusion layer base materials, gas and liquid filtration materials, medical materials such as patch base materials and plaster base materials, clothing materials such as interlining, and lotions A collection of fibers useful for various industrial materials such as skin care sheets, towels and diapers, cleaning products such as wiping materials and liquid absorption sheets, bioscience materials such as bioreactors and cell culture substrates, etc. The body can be manufactured.

DESCRIPTION OF SYMBOLS 100 ... Fiber assembly manufacturing apparatus 1 ... Air supply apparatus 2 ... Gas supply port 3 ... Case 4 ... Spinning start part 5 ... Power supply ground 6 ... Counter electrode Earth 7 ... Power supply 8 ... Collector 9a ... Collector 9b ... Back 10 ... Gas outlet 11 ... Spinning space 12 ... Exhaust device 13 ... Fiber Aggregate 200 ... Another fiber aggregate manufacturing apparatus 21 ... Another gas outlet

Claims (2)

(1) supplying gas adjusted in temperature and humidity to the spinning space and moving the gas existing in the spinning space to the gas outlet through the collector;
(2) A step of discharging the spinning dope from the spinning start portion to the spinning space and fiberizing mainly by the action of an electric field,
(3) collecting the fibers on the collecting surface of the collecting body, and forming a fiber assembly on the collecting surface;
A method for producing a fiber assembly comprising:
The gas outlet is in close proximity to the back surface facing the collection surface , and the gas inflow / outflow ratio of the gas is greater than 1.
A method for producing a fiber assembly characterized by the above . (1) an air supply device capable of supplying a gas whose temperature and humidity are adjusted to the spinning space;
(2) An exhaust device provided with a gas outlet, which allows gas existing in the spinning space to pass through the collector and move to the gas outlet;
(3) Spinning start section capable of discharging the spinning dope into the spinning space;
(4) Electric field forming means capable of fiberizing the spinning dope discharged from the spinning start part mainly by the action of an electric field,
(5) A collecting body that accumulates the fibers on the collecting surface of the collecting body and can form a fiber assembly on the collecting surface;
An apparatus for producing a fiber assembly comprising:
The gas discharge port is close to the back surface facing the collection surface , and the gas inflow / outflow ratio of the gas is greater than 1.
An apparatus for producing a fiber assembly characterized by the above .

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