JP7351711B2 - Fiber collection member and method for producing fiber deposit using the same - Google Patents

Description

The present invention relates to a fiber collecting member used for collecting fibers spun by electrospinning. The present invention also relates to a method for producing a fiber deposit using this fiber collection member.

Various techniques have been proposed for producing coatings made of fibers formed by electrospinning. For example, Patent Document 1 discloses a method of manufacturing a fiber structure by electrostatic spinning using a collection base material containing a conductive substance such as metal. Further, Patent Document 2 discloses a method of manufacturing a nanofiber film using a collection sheet in which a deposition area where fibers are deposited and a non-deposition area where fibers are not deposited coexist.

Although in a technical field different from the electrospinning method, Patent Document 3 discloses an electrospray method in which a solution material is sprayed from a nozzle toward a substrate provided with a mask portion to form a thin film on the substrate.

JP2007-92210A JP2011-84843A JP2016-32780A

Fiber deposits formed by electrospinning are used in various fields, and it is desired to freely and easily control the shape of the fiber deposits. According to the method described in Patent Document 1, it is possible to increase the production efficiency of fiber deposits. However, the method described in the same document does not assume that the shape of the fiber deposit can be freely controlled, and the shape cannot be controlled with this method.

In the method described in Patent Document 2, a fiber deposit is formed in a deposition region by applying a voltage to a conductor placed in a non-deposition region. Therefore, in the method described in the same document, the apparatus for producing the fiber deposit becomes complicated.

In the electrospray method described in Patent Document 3, the shape of the fiber deposit formed by the electrospinning method cannot be freely controlled.

Therefore, an object of the present invention is to freely and easily control the shape of a fiber deposit formed by electrospinning.

The present invention is a fiber collecting member having a collecting surface for collecting fibers spun by an electrospinning method,
The collection surface has a collection part where a deposit of the collected fibers is formed and a non-collection part where the deposit is not formed,
The present invention provides a fiber collecting member in which the surface electrical resistivity of the collecting section is lower than the surface electrical resistivity of the non-collecting section.

The present invention also provides a method for collecting fibers spun by an electrospinning method using a fiber collecting member to produce a deposit of the fibers, comprising:
The electrospinning method is performed using an electrospinning device having dimensions that can be held by a human hand,
As the fiber collecting member, a member having a collecting surface for collecting the fibers is used,
The collection surface has a collection part where a deposit of the collected fibers is formed and a non-collection part where the deposit is not formed,
The present invention provides a method for producing a fiber deposit, wherein the surface electrical resistivity of the collecting portion is lower than the surface electrical resistivity of the non-collecting portion.

According to the present invention, the shape of the fiber deposit formed by electrospinning can be freely and easily controlled.

FIG. 1 is a perspective view showing one embodiment of the fiber collecting member of the present invention. FIG. 2 is a schematic diagram showing an embodiment in which fibers spun by electrospinning are collected using the fiber collecting member shown in FIG. 1. FIG. 3 is a schematic diagram showing another embodiment in which fibers spun by electrospinning are collected using the fiber collecting member shown in FIG. 1. FIG. 4(a) is a plan view showing another embodiment of the fiber collecting member of the present invention, and FIG. 4(b) is a plan view showing the fibers formed on the collecting surface of the fiber collecting member. FIG. 2 is a cross-sectional view of a deposit.

Hereinafter, the present invention will be described based on preferred embodiments thereof with reference to the drawings. FIG. 1 schematically shows a fiber collection member 1 that is an embodiment of the present invention. The fiber collecting member 1 is used to collect fibers spun by electrospinning. The electrospinning method is a method in which a positive or negative high voltage is applied to a raw material liquid containing resin, which is a raw material for fibers, to charge the raw material liquid, and the charged raw material liquid is sprayed toward a target object. The sprayed raw material liquid spreads in the space while being repeatedly atomized by the Coulomb repulsion force, and a fiber deposit in which fibers with a narrow fiber diameter are deposited is formed on the surface of the object.

The raw material liquid is a solution or molten liquid containing a resin that is a raw material for fibers, and is liquid in the environment in which the electrospinning method is performed. As this solution, a solution in which a polymer compound capable of forming fibers is dissolved or dispersed in a solvent can be used. Examples of the solvent include water, methanol, ethanol, propanol, glycol, and the like. These solvents can be used alone or in combination. On the other hand, as the melt, a polymer compound capable of forming fibers can be heated and melted. In addition to the polymer compound, inorganic particles, organic particles, plant extracts, surfactants, oil agents, electrolytes for adjusting ion concentration, and the like can be appropriately blended into the raw material liquid.

The produced fiber deposit is applied to the skin around the eyes, mouth, nose, arms, etc., and the fiber deposit can effectively hide, for example, spots and wrinkles on the skin.

As shown in FIG. 1, the fiber collection member 1 is sheet-like or plate-like, and has a collection surface 1a for collecting fibers and a back surface 1b located on the opposite side. There is.

The fiber collecting member 1 is not particularly limited in its shape in plan view as long as it can collect spun fibers. Examples of the shape include a triangle, a quadrangle, a circle, an ellipse, and the like. FIG. 1 shows a fiber collecting member 1 having a rectangular shape. It is preferable that the fiber collecting member 1 has a size that can be carried by a person. The fiber collecting member 1 preferably has a dimension at the longest position of 30 mm or more and 500 mm or less, a dimension at the shortest position of 30 mm or more and 500 mm or less, and a dimension in the thickness direction Z: It is preferably 0.1 mm or more and 100 mm or less.

The fiber collecting member 1 has a collecting surface 1a. The collection surface 1a is a substantially flat surface without any undulations such as irregularities. The collection surface 1a has a collection portion 2 where fiber deposits are formed and a non-collection portion 3 where fiber deposits are not formed. In a plan view of the collection surface 1a, the collection portion 2 and the non-collection portion 3 are arranged on the collection surface 1a such that the collection portion 2 is surrounded by the non-collection portion 3. Alternatively, the collection section 2 and the non-collection section 3 may be arranged such that the non-collection section 3 is surrounded by the collection section 2 .

The shape, number, and arrangement position of the collecting section can be changed depending on the shape, number, and arrangement position of the target fiber deposits, and are not particularly limited. Examples of the shape of the collecting section when viewed in plan include polygonal shapes such as triangles, quadrangles, and hexagons, arrow shapes, and star shapes. Furthermore, shapes including curved parts and straight parts such as a semicircular shape and fan shape, and shapes including curved parts such as a crescent shape are also included.

From the viewpoint of the stability of the shape of the obtained fiber deposit, the number of trapping parts is preferably 1 to 10, and more preferably 1 to 4. In the embodiment shown in FIG. 1, one crescent-shaped collection section 2 is arranged at the center of the collection surface 1a. As shown in FIG. 1, when the collection part 2 is arranged so as to be surrounded by the non-collection part 3, the collection surface 1a is separated from the boundary between the collection part 2 and the non-collection part 3. The shortest distance to the outer edge is preferably 5 mm or more, more preferably 7 mm or more. When such a shortest distance is provided, it is possible to prevent fibers from being easily deposited on the collecting section 2 and from becoming difficult to obtain fiber deposits.

From the viewpoint of the stability of the shape of the obtained fiber deposit, the ratio of the area of the collection part 2 to the area of the collection surface 1a is preferably 25% or more and 98% or less, and 60% or more and 96% or less. It is more preferable that From the same viewpoint, the area of the collection surface 1a is preferably 100 mm ² or more and 90,000 mm ² or less, and more preferably 900 mm ² or more and 62,500 mm ² or less. The area of the collecting section 2 is the total area of the collecting sections 2 when a plurality of collecting sections 2 exist. From the same viewpoint, the area of the collection part 2 is preferably 25 mm ² or more and 87025 mm ² or less, and more preferably 625 mm ² or more and 60025 mm ² or less.
From the viewpoint of the stability of the shape of the obtained fiber deposit, the ratio of the area of the non-collecting portion 3 to the area of the collecting surface 1a is preferably 2% or more and 75% or less, and 4% or more and 40%. It is more preferable that it is the following. From the same viewpoint, the area of the non-trapping portion 3 is preferably 75 mm ² or more and 3000 mm ² or less, and more preferably 225 mm ² or more and 2500 mm ² or less. When a plurality of non-trapping portions 3 exist, the area of the non-trapping portion 3 is the total area of the non-trapping portions 3. Moreover, it is preferable that the minimum width of the non-trapping portion 3 is 5 mm or more.

FIG. 2 shows a state in which the fiber collection member 1 is used to collect fibers spun by electrospinning to produce a fiber deposit 10. In the figure, an electrospinning method is performed using an electrospinning device 5 having a size that can be held by a human hand. When operating the device 5, the manufacturer of the fiber deposit 10 holds the device 5 in one hand, the fiber collection member 1 in the other hand, and connects the nozzle (not shown) of the device 5. ) is directed toward the collection surface 1a of the fiber collection member 1. Then, the device 5 is powered on to perform electrospinning. By turning on the power of the electrospinning device 5, a conductive path via the manufacturer's human body is formed between the nozzle and the fiber collecting member 1, and an electric field is created between the nozzle and the fiber collecting member 1. arise. For example, by applying a positive high voltage to the nozzle, the fiber collecting member 1 can be grounded. When an electric field is generated between the nozzle and the fiber collecting member 1, the raw material liquid of the electrospinning composition at the tip of the nozzle is polarized by electrostatic induction, the tip becomes cone-shaped, and the raw material liquid of the electrospinning composition at the tip of the nozzle becomes cone-shaped. Droplets of the charged raw material liquid are discharged into the air toward the fiber collection member 1 along the electric field. The discharged raw material liquid is repeatedly stretched by electric attraction and self-repulsion due to the electric charge of the melt itself, and is made into ultra-fine fibers, and reaches the collection surface 1a. In this case, if the surface electrical resistivity of the collecting section 2 is lower than the surface electrical resistivity of the non-collecting section 3 on the collecting surface 1a, the charged composition will have a relatively high electrical resistance. It is easily repelled on the non-collecting portion 3, and is likely to be deposited on the collecting portion 2, where current easily flows. As a result, fiber deposits 10 are formed on the collection portion 2 on the collection surface 1a. According to the fiber collecting member 1, by changing the shape, number, and arrangement position of the collecting portions 2, the desired shape of the fiber deposit 10 can be freely and easily controlled. In addition, since there is no need to finely adjust the voltage applied by the electrospinning device, the fiber deposit 10 can be produced safely.

Various known devices can be used as the electrospinning device 5, such as the electrostatic spray device described in JP-A-2017-078062, the electrostatic spray device described in JP-A-2018-100301, and An electrostatic spray device described in Japanese Patent Publication No. 2019-38856, etc. can also be used.

In FIG. 2, the manufacturer of the fiber deposit 10 is carrying out the electrospinning method by holding the electrospinning device 5 in one hand and directly holding the fiber collection member 1 in the other hand. Alternatively, the electrospinning method may be performed as shown in FIG. In the figure, the fiber collection member 1 is placed on a conductive member 6 made of metal or the like, and the manufacturer holds the device 5 with one hand and the conductive member 6 with the other hand. We are using electrospinning method. When electrospinning is performed in such a state, since the fiber collection member 1 is placed in contact with the conductive member 6, there is a manufacturer's material between the nozzle and the fiber collection member 1. A conductive path is formed via the human body and the conductive member 6. As a result, similar to the embodiment shown in FIG. 2, fiber deposits 10 are formed on the collection portion 2 on the collection surface 1a.

The conductive member 6 is preferably plate-shaped, and its shape in plan view is not particularly limited as long as the fiber collection member 1 can be placed thereon. Examples of the shape include a triangle, a quadrangle, a circle, an ellipse, and the like. FIG. 3 shows a rectangular plate-shaped conductive member 6. As shown in FIG. Preferably, the conductive member 6 has a size that allows it to be carried by a person.

From the viewpoint of making it easier to form fiber deposits 10 on the collecting part 2 than on the non-collecting part 3, the ratio of the surface electrical resistivity of the non-collecting part 3 to the surface electrical resistivity of the collecting part 2 is as follows: It is preferably 2 times or more, and more preferably 2.5 times or more. The higher the upper limit of the ratio of surface electrical resistivity in the non-trapping section 3 is, the more preferable it is, but if it is about 2.5 times higher, fiber deposits 10 can be sufficiently formed on the collecting section 2. . The surface electrical resistivity of the collecting portion 2 is preferably 0.01 MΩ/cm ² or more, more preferably 0.05 MΩ/cm ² or more, and 5.0×10 ⁵ MΩ/cm ² or less. It is preferably 2.8×10 5 MΩ/cm 2 or less, and more preferably 2.8×10 ⁵ MΩ/cm ² or less. The surface electrical resistivity of the non-trapping portion 3 is preferably 1.0×10 ⁴ MΩ/cm ² or more, more preferably 2.5×10 ⁴ MΩ/cm ² or more, and 1. It is preferably 0×10 ¹⁰ MΩ/cm ² or less, and more preferably 1.0×10 ⁷ MΩ/cm ² or less. The surface electrical resistivity of the collecting portion 2 and the non-collecting portion 3 is measured using electrical resistance meters R8340A and R12704 manufactured by ADVANTEST under a temperature and humidity environment of a room temperature of 23° C. and a relative humidity of 50%.

It is preferable that the collecting section 2 extends from the collecting surface 1a to the back surface 1b of the fiber collecting member 1. With such a configuration, a conductive path via the manufacturer's human body is likely to be formed between the nozzle and the fiber collecting member 1, and fiber deposits 10 are likely to be formed on the collecting section 2. From this point of view, it is preferable that the electric resistance of the collecting section 2 is uniform from the collecting surface 1a to the back surface 1b. Therefore, when the collecting section 2 extends from the collecting surface 1a to the back surface 1b, the surface electrical resistivity of the collecting section 2 on the back surface 1b is the same as the surface electrical resistivity of the collecting section 2 on the collecting surface 1a. Preferably, it is a value.

As shown in FIG. 4(a), the surface electrical resistivity of the boundary part 4 between the collecting part 2 and the non-collecting part 3 is higher than that of the collecting part 2 and lower than that of the non-collecting part 3. Preferably, it is more preferable that the amount gradually decreases from the non-collecting portion 3 toward the collecting portion 2. When such a boundary portion 4 is provided, the thickness of the fiber deposit 10 on the collecting portion 2 tends to decrease toward the outside at its peripheral edge, as shown in FIG. 2(b). Become. When such a fiber deposit 10 is attached to an object, the outer periphery of the fiber deposit 10 becomes less noticeable. The width of the boundary portion 4 is preferably 1 mm or more and 50 mm or less, and more preferably 3 mm or more and 30 mm or less. The width of the boundary portion 4 is the minimum width of the boundary portion 4 when the collection surface 1a is viewed from above.

It is preferable that the fiber collecting member 1 has air permeability. Thereby, air exists between the collection surface 1a and the fiber deposit 10, making it easier to peel off the fiber deposit 10 from the collection surface 1a. The air permeability of the fiber collection member 1 is a value measured according to JIS P8117 (2009 revised edition), and is preferably 0.05 seconds or more, more preferably 0.01 seconds or more, The time is preferably 30 seconds or less, and more preferably 20 seconds or less.

As the fiber collecting member 1 having air permeability, a fiber sheet or a sponge can be used. Examples of the fiber sheet include various nonwoven fabrics, woven fabrics, knitted fabrics, paper, mesh sheets, and laminates thereof. Examples of the sponge include porous materials made of foamed synthetic resin or natural resin, such as foamed resin. From the viewpoint of economy and ease of handling, it is preferable that the fiber collection member 1 is a nonwoven fabric.

As the raw material nonwoven fabric constituting the fiber collection member 1, a general nonwoven fabric can be used. From the viewpoint of making the electrical resistance of the collecting section 2 uniform from the collecting surface 1a to the back surface 1b, it is preferable to use a conductive nonwoven fabric. Examples of conductive nonwoven fabrics include nonwoven fabrics made by kneading carbon into rayon fibers, such as nonwoven fabrics manufactured by Shinwa Co., Ltd. (71502-B), or nonwoven fabrics made by coating polyester fibers with copper and nickel, such as A conductive nonwoven fabric (Sui-80-75ES) manufactured by KB Seiren Co., Ltd., etc. can be used.

When using a conductive nonwoven fabric, it is preferable to coat the surface of the nonwoven fabric with a substance that increases the surface electrical resistivity. By applying the substance, the surface electrical resistivity of that part increases and becomes a non-trapping part 3. Since there is no change in the surface electrical resistivity of the part to which the substance is not applied, this part becomes the collecting part 2 having a lower surface electrical resistivity than the non-collecting part 3. In this way, the fiber collecting member 1 can be manufactured. Examples of substances that increase surface electrical resistivity include general-purpose polymers, engineering plastics, and rubber. Specifically, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyethylene terephthalate, polybutylene terephthalate, modified polyphenylene ether, 6-nylon, 6,6-nylon, acetal resin, polyamide, carbonate resin, ethylene/vinyl acetate. Examples include saponified copolymers, ABS resins, methacrylic resins, polyvinylidene chloride, fluororesins, styrene-butadiene rubber, butadiene rubber, isoprene rubber, neoprene rubber, and the like. These substances can be used alone or in combination of two or more. Alternatively, a substance that reduces surface electrical resistivity may be applied to the surface of the conductive nonwoven fabric. By applying the substance, the surface electrical resistivity of that part decreases and becomes the collection part 2. Since there is no change in the surface electrical resistivity of the part to which the substance is not applied, the part is not used for collection. The non-trapping portion 3 has a higher surface electrical resistivity than the portion 2. Examples of substances that reduce surface electrical resistivity include conductive fillers and surfactants. Examples of conductive fillers include tin oxide, zinc oxide, titanium oxide, ITO, potassium titanate fiber, silver, gold, copper, aluminum, palladium, nickel/carbon, carbon black, CNT, carbon nanofiber, carbon fiber, graphite, etc. can be mentioned. Examples of the surfactant include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.
Examples of anionic surfactants include fatty acid salts derived from fatty acids having 8 or more carbon atoms such as sodium laurate and potassium palmitate; alkyl sulfate salts such as sodium lauryl sulfate, potassium lauryl sulfate, and sodium stearyl sulfate; Alkyl ether sulfate ester salts such as oxyethylene lauryl sulfate triethanolamine; N-acyl sarcosine salts such as sodium lauroyl sarcosine; N-acyl methyl taurate salts such as sodium N-myristoyl-N-methyl taurate; N-myristoyl-L- N-acyl fatty acid glutamates such as sodium glutamate, disodium N-stearoylglutamate, monosodium N-lauroylmyristoyl-L-glutamate, and N-cocoylglutamic acid triethanolamine salt; sulfosuccinic acid such as sodium di-2-ethylhexylsulfosuccinate salts, polyoxyethylene alkyl ether phosphates such as sodium polyoxyethylene cetyl ether phosphate; and the like.
As the cationic surfactant, for example, an alkyltrimethylammonium budamide selected from cetyltrimethylammonium bromide, behenyltrimethylammonium chloride, distearyldimethylammonium chloride, tricetylmethylammonium chloride, stearyldimethylbenzylammonium chloride, etc.; dicetyldimethyl Alkyldimethylammonium chloride selected from ammonium chloride, distearyldimethylammonium chloride, dialkyldimethylammonium chloride, dibehenyldimethylammonium chloride, etc., and quaternary ammonium salts such as benzalkonium chloride, and dimethyldistearylammonium salts. It will be done.
Examples of amphoteric surfactants include stearyl betaine and lauryl betaine.
Nonionic surfactants include, for example, ethylene glycol fatty acid esters such as ethylene glycol monostearate; polyethylene glycol fatty acid esters such as polyethylene glycol (2) monostearate; polyethylene glycol (5) polyesters such as decyl pentadecyl ether; Alkylene glycol alkyl ether; polyethylene glycol hydrogenated castor oil such as polyethylene glycol (5) hydrogenated castor oil monoisolaurate; propylene glycol fatty acid ester; monoglycerin monofatty acid ester such as glycerin monoisostearate; glycerin distearate, glycerin di Monoglycerin difatty acid esters such as lauric acid esters; glycerin alkyl ethers such as glycerin monoisostearyl ether; sorbitan fatty acid esters such as sorbitan monostearate; fatty acid dialkanolamides such as fatty acid alkanolamide, lauric acid diethanolamide, monostearin Examples include polyoxyethylene sorbitan fatty acid esters such as acid polyoxyethylene sorbitan.
These substances can be used alone or in combination of two or more.

When using a conductive nonwoven fabric, an insulating plate made of plastic, glass, or the like may be placed on the surface of the nonwoven fabric instead of applying the above-mentioned substance. The part on which the plate is placed becomes the non-collecting part 3, and the other part becomes the collecting part 2. From the viewpoint of easy formation of fiber deposits 10 on the collecting part 2, the difference in the thickness direction between the position of the non-collecting part 3 and the position of the collecting part 2 is preferably 3 mm or less, and preferably 1 mm or less. It is even more preferable that there be.

When using a non-conductive non-woven fabric, it is preferable to coat the surface of the non-woven fabric with a substance that reduces the surface electrical resistivity. By applying the substance, the surface electrical resistivity of that part decreases and becomes the collection part 2. Since there is no change in the surface electrical resistivity of the part to which the substance is not applied, the part is not used for collection. The non-trapping portion 3 has a higher surface electrical resistivity than the portion 2. In this way, the fiber collecting member 1 can be manufactured.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above embodiments.

Hereinafter, the present invention will be explained in more detail with reference to Examples. However, the scope of the invention is not limited to such examples. Unless otherwise specified, "%" means "% by mass".

[Example 1]
A rectangular nonwoven fabric (71502-B) manufactured by Shinwa Co., Ltd. was prepared. The basis weight of the nonwoven fabric was 50 g/m ² , the length in the longitudinal direction was 100 mm, and the length in the width direction was 80 mm. In addition, an insulating film coating agent (CD-101) manufactured by Sanwa Supply Co., Ltd. was prepared. The portion of the nonwoven fabric that would become the collection portion was hidden with tape, and then the insulating film coating agent was sprayed for 10 seconds at a distance of 150 mm from the nonwoven fabric. Thereafter, the tape was peeled off to obtain the fiber collecting member shown in FIG.

[Example 2]
In place of the insulating film coating agent used in Example 1, an antistatic spray (TC-SB200) manufactured by Trusco Nakayama Co., Ltd. was prepared. The non-collection portion of the nonwoven fabric was covered with tape, and then antistatic spray was applied. Other than these, the fiber collecting member shown in FIG. 1 was obtained in the same manner as in Example 1.

[Example 3]
In place of the nonwoven fabric used in Example 1, Benliese (registered trademark), a nonwoven fabric manufactured by Asahi Kasei Corporation, was prepared. The basis weight of the nonwoven fabric was 100 g/m ² . Other than that, the fiber collecting member shown in FIG. 1 was obtained in the same manner as in Example 2.

[Example 4]
After producing the same fiber collection member as in Example 1, an antistatic spray was further applied to the central part of the part that had been hidden with tape. The antistatic spray is the same as that prepared in Example 2. In this way, a fiber collecting member shown in FIG. 4 having a boundary part in addition to a collecting part and a non-collecting part was obtained.

[Example 5]
In place of the nonwoven fabric used in Example 1, Eltas Aqua (registered trademark), a nonwoven fabric manufactured by Asahi Kasei Corporation, was prepared. The basis weight of the nonwoven fabric was 20 g/m ² . Other than that, the fiber collecting member shown in FIG. 1 was obtained in the same manner as in Example 2.

[Example 6]
In place of the nonwoven fabric used in Example 1, RP6440M, a nonwoven fabric manufactured by Ikeda Shigyo Co., Ltd., was prepared. The basis weight of the nonwoven fabric was 40 g/m ² . Other than that, the fiber collecting member shown in FIG. 1 was obtained in the same manner as in Example 1.

[Example 7]
In place of the nonwoven fabric used in Example 1, polyester film Lumirror (registered trademark) #100-S10 manufactured by Toray Industries, Inc. was prepared. The basis weight of the film was 80 g/m ² . Other than that, the fiber collecting member shown in FIG. 1 was obtained in the same manner as in Example 2.

[Comparative example 1]
The raw material nonwoven fabric prepared in Example 3 was used as the fiber collection member of this comparative example.

[Rating 1]
Regarding the fiber collecting member of each example, the surface electrical resistivity of the collecting part and non-collecting part was measured by the method described above. Regarding the fiber collection member of Example 4, the surface electrical resistivity of the boundary portion was also measured. Regarding the fiber collection member of Comparative Example 1, the surface electrical resistivity of the entire surface was measured. The results are shown in Table 1.

[Evaluation 2]
Using the fiber collection members obtained in Examples and Comparative Examples, as shown in FIG. 2, the manufacturer held an electrospinning device in one hand, and was held in the other hand and subjected to electrospinning to produce a fiber deposit. The conditions for the electrospinning method are as follows. The collecting ability of the fiber collecting member was evaluated by visually observing the state of the fiber deposits formed on the collecting surface and using the following criteria. The results are shown in Table 1.

[Conditions for electrospinning method]
As the electrospinning device, an electrostatic spray device described in JP-A-2017-078062 was prepared. As a composition for electrospinning, a composition containing 88% of 99.5% ethanol (0.5% of water) and 12% of polyvinyl butyral was prepared. As the polyvinyl butyral, S-LEC B BM-1 (trade name) manufactured by Sekisui Chemical Co., Ltd. was used.
The discharge rate of the composition from the nozzle of the electrostatic spray device was set to 0.12 g/min, and the applied voltage was set to 14.5 kV. Under these conditions, spinning was performed toward the collection surface of the fiber collection member. The distance between the tip of the nozzle and the collection surface was set to 100 mm. The surrounding environment when performing the electrospinning method was 25° C. and 45% RH.

[Evaluation criteria for the collection performance of fiber collection members]
A: The shape of the fiber deposits can be clearly confirmed visually.
B: The shape of the fiber deposits can be visually confirmed.
C: The shape of the fiber deposits can be confirmed visually, but the fiber deposits are widely spread.
D: Part of the shape of the fiber deposits can be visually confirmed.
E: The shape of the fiber deposits cannot be visually confirmed.

As is clear from the results shown in Table 1, it can be seen that the shape of the fiber deposits obtained using the fiber collection members of each example can be visually confirmed. In contrast, it can be seen that the shape of the fiber deposit obtained using the fiber collection member of Comparative Example 1 cannot be visually confirmed.

1 Fiber collection member 1a Collection surface 2 Collection portion 3 Non-collection portion 4 Boundary portion 5 Electrospinning device 6 Conductive member 10 Fiber deposit

Claims (8)

A method of collecting fibers spun by an electrospinning method with a fiber collecting member to produce a deposit of the fibers, the method comprising:
The electrospinning method is performed using an electrospinning device having dimensions that can be held by a human hand,
As the fiber collecting member, a member having a collecting surface for collecting the fibers is used,
The collection surface has a collection part where a deposit of the collected fibers is formed and a non-collection part where the deposit is not formed,
The surface electrical resistivity of the collecting portion is lower than the surface electrical resistivity of the non-trapping portion,
The manufacturer of the fiber deposit holds the electrospinning device in one hand and the fiber collection member in the other hand, and creates a space between the electrospinning device and the fiber collection member. A method for producing a fiber deposit, wherein spinning is performed toward the collection surface of the fiber collection member in a state where a conductive path is formed through the human body of the manufacturer. A method of collecting fibers spun by an electrospinning method with a fiber collecting member to produce a deposit of the fibers, the method comprising:
The electrospinning method is performed using an electrospinning device having dimensions that can be held by a human hand,
As the fiber collecting member, a member having a collecting surface for collecting the fibers is used,
The collection surface has a collection part where a deposit of the collected fibers is formed and a non-collection part where the deposit is not formed,
The surface electrical resistivity of the collecting portion is lower than the surface electrical resistivity of the non-trapping portion,
A manufacturer of the fiber deposit holds the electrospinning device in one hand and the conductive member on which the fiber collection member is placed in the other hand, and connects the electrospinning device and the fiber collection device. The fibers are spun toward the collection surface of the fiber collection member while a conductive path is formed between the fiber collection member and the fiber collection member through the human body of the manufacturer and the conductive member. Method of manufacturing deposits. The method for producing a fiber deposit according to claim 1 or 2 , wherein the non-trapping portion has a surface electrical resistivity of 1.0×10 ⁴ MΩ/cm ² or more. The method for producing a fiber deposit according to any one of claims 1 to 3 , wherein the non-trapping portion has a surface electrical resistivity of 1.0×10 ¹⁰ MΩ/cm ² or less. The method for producing a fiber deposit according to any one of claims 1 to 4 , wherein the non-trapping portion is coated with a substance that increases surface electrical resistivity. The method for producing a fiber deposit according to any one of claims 1 to 5 , wherein the surface electrical resistivity of the collecting portion is 5.0×10 ⁵ MΩ/cm ² or less. The method for producing a fiber deposit according to any one of claims 1 to 6 , wherein the collecting portion is coated with a substance that reduces surface electrical resistivity. According to any one of claims 1 to 7 , the surface electrical resistivity of the boundary portion between the collection portion and the non-trapping portion gradually decreases from the non-trapping portion toward the collection portion. A method for producing fiber deposits .

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