WO2018100830A1

WO2018100830A1 - Nozzle head and electrospinning device

Info

Publication number: WO2018100830A1
Application number: PCT/JP2017/032475
Authority: WO
Inventors: 静雄木下; 健哉内田; 聡美坂井; 佑磨菊地
Original assignee: 株式会社東芝
Priority date: 2016-12-02
Filing date: 2017-09-08
Publication date: 2018-06-07
Also published as: JP2018090924A; JP6322688B1

Abstract

The problem to be addressed by the present invention is to provide a nozzle head and an electrospinning device in which the nozzle head can be miniaturized and the driving voltage can be reduced. This nozzle head (2) is provided with: a main body part (22) having a space (22b) thereinside that is capable of accommodating a raw liquid; a first nozzle group (12a) that is connected to the main body part (22) and includes at least one nozzle (20); and a second nozzle group (12b) that is connected to the main body part (22) and includes at least one nozzle (20). The nozzle (20) belonging to the second nozzle group (12b) extends in a direction which is gradually away from the nozzle (20) belonging to the first nozzle group (12a) toward the tip side as viewed from the direction in which the main body part (22) extends.

Description

Nozzle head and electrospinning apparatus

Embodiments of the present invention relate to a nozzle head and an electrospinning apparatus.

There is an electrospinning apparatus that deposits fine fibers on the surface of a member by an electrospinning method (also referred to as an electrospinning method, a charge induction spinning method, or the like).
The electrospinning apparatus is provided with a plurality of nozzle holes for discharging the raw material liquid. In this case, if the number of nozzle holes is increased, the amount of fibers generated per unit time or per unit area can be increased. For this reason, there has been proposed a nozzle head in which a plurality of nozzle holes are arranged in a line on the end surfaces of two plate-like portions provided so as to be parallel to each other. If the nozzle head has such a configuration, productivity can be improved.

However, if the distance between the plate-like portions is shortened in the two plate-like portions provided so as to be parallel to each other, electric field interference occurs between the two plate-like portions, and the fiber formation becomes unstable. Become. Therefore, it is necessary to increase the distance between the two plate-like portions to some extent, and it is difficult to reduce the size of the nozzle head. In addition, when nozzle holes are provided in the plate-like portion, electric field concentration is unlikely to occur in the portion where the nozzle holes are opened, and thus it is difficult to reduce the drive voltage.
Therefore, it has been desired to develop a technique that can reduce the size of the nozzle head and reduce the driving voltage.

JP 2012-184518 A JP 2013-231247 A

The problem to be solved by the present invention is to provide a nozzle head and an electrospinning apparatus capable of reducing the size of the nozzle head and reducing the driving voltage.

The nozzle head according to the embodiment is connected to the main body having a space inside which the raw material liquid can be stored, the first nozzle group connected to the main body and including at least one nozzle, and the main body. A second nozzle group including at least one nozzle. When viewed from the direction in which the main body extends, the nozzles belonging to the second nozzle group extend in a direction away from the nozzles belonging to the first nozzle group as becoming the tip side.

It is a schematic diagram for illustrating the electrospinning apparatus according to the present embodiment. It is a model perspective view for illustrating the nozzle head concerning this embodiment. It is a model perspective view for illustrating the nozzle head concerning other embodiments. (A), (b) is a schematic cross section of a nozzle.

Hereinafter, embodiments will be illustrated with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
1 to 3, the X axis and the Y axis represent directions orthogonal to each other. In this case, the X axis represents the direction (axial direction) in which the main body portion 22 extends.
As shown in FIG. 1, the electrospinning apparatus 1 is provided with a nozzle head 2, a raw material liquid supply unit 3, a power source 4, a collection unit 5, and a control unit 6.

As shown in FIGS. 1 and 2, the nozzle head 2 includes a nozzle 20, a connection portion 21, a main body portion 22, and an attachment portion 23.
A plurality of nozzles 20 are provided. The plurality of nozzles 20 are divided into a plurality of nozzle groups. In this case, at least one nozzle 20 is provided in one nozzle group. In the following, a case where a plurality of nozzles 20 are provided in one nozzle group will be described as an example.
In one nozzle group, the plurality of nozzles 20 are provided side by side in the X-axis direction. For example, the first nozzle group 12a includes a plurality of nozzles 20 that are connected to the main body portion 22 and arranged in the X-axis direction. The second nozzle group 12b is connected to the main body portion 22 and includes a plurality of nozzles 20 arranged side by side in the X-axis direction. The nozzle head 2 illustrated in FIGS. 1 and 2 is provided with eight nozzles 20 divided into two

nozzle groups

12a and 12b. The number of nozzle groups and the number of nozzles 20 belonging to one nozzle group are not limited to those illustrated, and can be changed as appropriate according to the size of the collecting body 51 and the like.

Further, as shown in FIG. 2, the positions of the plurality of nozzles 20 belonging to the first nozzle group 12a and the positions of the plurality of nozzles 20 belonging to the second nozzle group 12b are different in the X-axis direction. ing. For example, the plurality of nozzles 20 belonging to the first nozzle group 12a and the plurality of nozzles 20 belonging to the second nozzle group 12b can be provided at positions shifted from each other by ½ pitch. In this way, the region where the fiber 100 formed from the raw material liquid drawn from the one nozzle 20 belonging to the first nozzle group 12 a accumulates, and the raw material drawn from the nozzle 20 adjacent to the one nozzle 20. Between the region where the fiber 100 formed from the liquid is deposited, the fiber 100 formed from the raw material liquid drawn from the nozzle 20 belonging to the second nozzle group 12b can be deposited.

Therefore, even if the pitch dimension of the plurality of nozzles 20 in the first nozzle group 12a and the pitch dimension of the plurality of nozzles 20 in the second nozzle group 12b are increased, the occurrence of unevenness in the deposit 110 is suppressed. be able to. This also means that the apparent pitch dimension of the plurality of nozzles 20 in the X-axis direction can be shortened. Therefore, compared with the case where the same number of nozzles 20 are arranged in a line, the length of the main body 22 can be shortened, and the nozzle head 2 can be downsized.

In addition, since the pitch dimension of the plurality of nozzles 20 in the first nozzle group 12a and the pitch dimension of the plurality of nozzles 20 in the second nozzle group 12b can be increased, the plurality of nozzles in the first nozzle group 12a are plural. Electric field interference between the end surfaces of the nozzles 20 on the discharge port 20a side, electric field interference between the end surfaces on the discharge port 20a side of the plurality of nozzles 20 in the second nozzle group 12b, and the first nozzle group The electric field interference between the end surface on the discharge port 20a side of the nozzle 20 belonging to 12a and the end surface on the discharge port 20a side of the nozzle 20 belonging to the second nozzle group 12b can be suppressed. Therefore, the formation of the fiber 100 can be stabilized.

The plurality of nozzles 20 have a needle shape. Inside the nozzle 20, a hole for discharging the raw material liquid is provided. The hole for discharging the raw material liquid penetrates between the end surface of the nozzle 20 on the connection portion 21 side and the end surface (tip) of the nozzle 20 on the side where the raw material liquid is discharged. An opening of the hole provided in the nozzle 20 on the side from which the raw material liquid is discharged becomes a discharge port 20a.

Further, the plurality of nozzles 20 belonging to the first nozzle group 12a are parallel to each other. The plurality of nozzles 20 belonging to the second nozzle group 12b are parallel to each other.

Further, as viewed from the Y-axis direction, the nozzles 20 belonging to the first nozzle group 12a and the nozzles 20 belonging to the second nozzle group 12b are parallel to each other.

However, when viewed from the X-axis direction, the direction in which the plurality of nozzles 20 belonging to the second nozzle group 12b extends intersects the direction in which the plurality of nozzles 20 belonging to the first nozzle group 12a extends. That is, when viewed from the X-axis direction, the direction in which the plurality of nozzles 20 belonging to the second nozzle group 12b extends is not parallel to the direction in which the plurality of nozzles 20 belonging to the first nozzle group 12a extends.

In addition, when viewed from the X-axis direction, the plurality of nozzles 20 belonging to the second nozzle group 12b are separated from the plurality of nozzles 20 belonging to the first nozzle group 12a toward the tip side (discharge port 20a side). It extends. A distance L1 projected in the X-axis direction between the tips of the plurality of nozzles 20 belonging to the first nozzle group 12a and the tips of the plurality of nozzles 20 belonging to the second nozzle group 12b when viewed from the X-axis direction is The cross-sectional dimension L3 of the main body 22 is longer.
In this way, when viewed from the X-axis direction, the first nozzle group 12a and the plurality of nozzles 20 belonging to the second nozzle group 12b are parallel to the first nozzle group 12a. The distance L1 between the end surface on the discharge port 20a side of the plurality of nozzles 20 belonging to the nozzle group 12a and the end surface on the discharge port 20a side of the plurality of nozzles 20 belonging to the second nozzle group 12b may be increased. it can. Therefore, electric field interference occurs between the end surfaces on the discharge port 20a side of the plurality of nozzles 20 belonging to the first nozzle group 12a and the end surfaces on the discharge port 20a side of the plurality of nozzles 20 belonging to the second nozzle group 12b. Can be suppressed. As a result, the formation of the fiber 100 can be stabilized.
According to the knowledge obtained by the present inventors, the X axis between the direction in which the plurality of nozzles 20 belonging to the first nozzle group 12a extends and the direction in which the plurality of nozzles 20 belonging to the second nozzle group 12b extends. The angle θ1 projected in the direction is preferably 30 ° or more and 150 ° or less.
If θ1 is 30 ° or more and 150 ° or less, the nozzle head 2 can be reduced in size, the electric field interference between the first nozzle group 12a and the second nozzle group 12b can be suppressed, and the stable fiber 100 on the member surface can be formed. It is suitable for realizing deposition. Furthermore, when improving the volatility of the raw material liquid and arranging a plurality of nozzle heads 2, θ1 is more preferably 45 ° or more and 75 ° or less.

In addition, a distance L2 between the end surface on the connection portion 21 side of the plurality of nozzles 20 belonging to the first nozzle group 12a and the end surface on the connection portion 21 side of the plurality of nozzles 20 belonging to the second nozzle group 12b, The distance can be shorter than the distance L1. Therefore, it becomes easy to make the cross-sectional dimension L3 of the main-body part 22 shorter than the distance L1. If the cross-sectional dimension L3 of the main body 22 can be made shorter than the distance L1, the nozzle head 2 can be reduced in size.

The outer shape of the nozzle 20 is not particularly limited, but by forming a needle shape, electric field concentration tends to occur on the end surface of the nozzle 20 on the discharge port 20a side. If electric field concentration occurs on the end surface of the nozzle 20 on the discharge port 20a side, the strength of the electric field formed between the nozzle 20 and the collector 51 can be increased. Therefore, the voltage applied by the power supply 4 can be lowered. That is, the drive voltage can be reduced. In this case, the cross-sectional dimension of the nozzle 20 can be about 1 mm, for example.

There is no particular limitation on the cross-sectional dimension of the discharge port 20a (the cross-sectional dimension in the direction orthogonal to the discharge direction of the raw material liquid). The cross-sectional dimension of the discharge port 20a can be appropriately changed according to the cross-sectional dimension of the fiber 100 to be formed. The cross-sectional dimension of the discharge port 20a can be, for example, 200 μm or more.
There is no particular limitation on the length of the nozzle 20.
The pitch dimension of the plurality of nozzles 20 belonging to the first nozzle group 12a can be set to about 20 mm, for example. The pitch dimension of the plurality of nozzles 20 belonging to the second nozzle group 12b can be, for example, about 20 mm.

The nozzle 20 is made of a conductive material. It is preferable that the material of the nozzle 20 has conductivity and resistance to the raw material liquid. The nozzle 20 can be formed from, for example, stainless steel.

The connection portion 21 is provided between the main body portion 22 and the plurality of nozzles 20 belonging to the first nozzle group 12a and the plurality of nozzles 20 belonging to the second nozzle group 12b.
The end of the nozzle 20 on the connection part 21 side is fixed to the connection part 21. The connection part 21 is detachably provided on the main body part 22. That is, the plurality of nozzles 20 belonging to the first nozzle group 12a and the plurality of nozzles 20 belonging to the second nozzle group 12b are detachably connected to the main body portion 22. For example, a male screw can be provided at the end of the connecting portion 21 on the main body 22 side, and a female screw can be provided on the side surface of the main body 22. Moreover, the connection part 21 can also be provided in the main-body part 22 detachably using a luer taper (it is also called a luer adapter, a luer lock, a luer connector, a luer fit etc.). For example, a female luer can be provided on the side of the main body 22 of the connecting portion 21, and a male luer can be provided on the side surface of the main body 22. That is, the connection part 21 is connected to the main body part 22 using a screw or a luer taper.

Inside the connection portion 21, a hole for supplying the raw material liquid from the main body portion 22 to the nozzle 20 is provided. The hole provided in the connection portion 21 is connected to the hole provided in the nozzle 20 and the space 22 b provided in the main body portion 22.
The connection part 21 is formed from a conductive material. It is preferable that the material of the connection portion 21 has conductivity and resistance to the raw material liquid. The connection part 21 can be formed from stainless steel etc., for example.

Here, the discharged raw material liquid may adhere to the end surface of the nozzle 20 on the discharge port 20a side and the vicinity thereof. When the attached raw material liquid is hardened, there is a possibility that the amount of the raw material liquid to be discharged decreases or the raw material liquid is not discharged. Therefore, the end surface of the nozzle 20 on the discharge port 20a side and the vicinity thereof are cleaned as necessary or periodically. In this case, since the strength of the nozzle 20 is low because it has a needle shape, the plurality of nozzles 20 may be bent or broken when the nozzles 20 are collectively cleaned. Therefore, it is necessary to clean the plurality of nozzles 20 one by one.
Since the nozzle head 2 according to the present embodiment is provided with the connection portion 21, the plurality of nozzles 20 can be detached from the main body portion 22 one by one. Then, the plurality of removed nozzles 20 can be collectively cleaned using a solvent, or wiped before the attached raw material liquid is solidified. In addition, the solvent used for cleaning can be the same as the solvent contained in the raw material liquid described later.

The main body 22 has a rod shape. A space 22b in which the raw material liquid is stored is provided inside the main body 22. The main body 22 is provided with a supply port 22a. The raw material liquid supplied from the raw material liquid supply unit 3 is introduced into a space 22b provided inside the main body 22 through the supply port 22a. There are no particular restrictions on the location and number of the supply ports 22a. For example, the supply port 22 a can be provided on the side surface of the main body portion 22, or can be provided on the attachment portion 23.

Although there is no particular limitation on the cross-sectional shape of the main body portion 22, the cross-sectional shape of the main body portion 22 is preferably a regular polygon in consideration of providing a plurality of connection portions 21. Since the regular polygon is a line-symmetric figure, it is easy to provide a plurality of nozzles 20 divided into a plurality of groups. For example, the cross-sectional shape of the main body 22 illustrated in FIGS. 1 and 2 is a regular hexagon. In this case, a plurality of nozzles 20 belonging to the first nozzle group 12a are provided on one side surface of the main body portion 22, and a plurality of nozzles 20 belonging to the second nozzle group 12a are provided on the side surface adjacent to the main body portion 22. In this case, the above-described angle θ1 can be set to 60 °. The cross-sectional shape of the main body portion 22 may be circular, and a flat portion (seat surface) may be provided in a portion where the plurality of connection portions 21 are provided.

Further, if the angle formed by the surface on which the plurality of nozzles 20 belonging to the first nozzle group 12a and the surface on which the plurality of nozzles 20 belonging to the second nozzle group 12a are provided is θ2, the angle θ1 described above is as follows: It can be expressed by the following formula.
θ1 = 180 ° −θ2

As shown in FIG. 2, the attachment portions 23 are provided at both ends of the main body portion 22. For example, the attachment portion 23 may have a cylindrical shape. The attachment portion 23 is detachably held by a holder (not shown) provided at a predetermined position above the collection body 51. That is, the nozzle head 2 is detachably provided at a predetermined position above the collecting body 51. In addition, you may make it provide fastening means, such as a female screw and a male screw, in the attachment part 23. FIG.

FIG. 3 is a schematic perspective view for illustrating a nozzle head 2a according to another embodiment.
4A and 4B are schematic cross-sectional views of the nozzle 120. FIG.
As illustrated in FIG. 3, the nozzle head 2 a includes a nozzle 120, a connection portion 21, a main body portion 22, and an attachment portion 23.
The nozzle 20 described above has a needle shape, but the nozzle 120 has a conical shape. The cross-sectional dimension of the tip of the nozzle 120 can be, for example, about 1 mm. If the nozzle 120 has a conical shape, the mechanical strength of the nozzle 120 itself can be increased. In addition, since the tip of the nozzle 120 can be sharpened, electric field concentration tends to occur on the end surface of the nozzle 120 on the discharge port 20a side. Therefore, since the strength of the electric field formed between the nozzle 120 and the collecting body 51 can be increased, the voltage applied by the power source 4 can be reduced as compared with the case where the nozzle has a cylindrical shape. That is, the drive voltage can be reduced. However, if the needle-like nozzle 20 is used, the drive voltage can be further reduced.

Further, as shown in FIGS. 4A and 4B, if the nozzle 120 has a conical shape, the cross-sectional dimension of the hole 120a provided in the nozzle 120 can be increased. In this case, as shown to Fig.4 (a), the cross-sectional dimension can increase gradually as the hole 120a leaves | separates from the discharge port 20a. Moreover, as shown in FIG.4 (b), the cross-sectional dimension can also be made to become large in steps as the hole 120a leaves | separates from the discharge port 20a. Since the hole 120a serves as a flow path for the raw material liquid, the flow path resistance can be reduced if the cross-sectional dimension of the hole 120a can be increased. Therefore, the supply of the raw material liquid can be made smooth.

As shown in FIG. 1, the raw material liquid supply unit 3 includes a storage unit 31, a supply unit 32, a raw material liquid control unit 33, and a pipe 34.
The storage unit 31 stores the raw material liquid. The accommodating part 31 is formed from the material which has the tolerance with respect to a raw material liquid. The accommodating part 31 can be formed from stainless steel etc., for example.

The raw material liquid is obtained by dissolving a polymer substance in a solvent.
There is no particular limitation on the polymer substance, and it can be changed as appropriate according to the material of the fiber 100 to be formed. Examples of the polymer substance include polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polyvinyl chloride, polycarbonate, nylon, and aramid.

The solvent may be any solvent that can dissolve the polymer substance. The solvent can be appropriately changed according to the polymer substance to be dissolved. The solvent can be, for example, methanol, ethanol, isopropyl alcohol, acetone, benzene, toluene, and the like.
The polymer substance and the solvent are not limited to those illustrated.

The raw material liquid is allowed to stay in the vicinity of the discharge port 20a due to surface tension. Therefore, the viscosity of the raw material liquid can be appropriately changed according to the size of the discharge port 20a. The viscosity of the raw material liquid can be obtained by performing experiments and simulations. The viscosity of the raw material liquid can be controlled by the mixing ratio of the solvent and the polymer material.

The supply unit 32 supplies the raw material liquid stored in the storage unit 31 to the main body unit 22. The supply unit 32 can be, for example, a pump having resistance to the raw material liquid. The supply unit 32 may supply gas to the storage unit 31 and pump the raw material liquid stored in the storage unit 31, for example.

The raw material liquid control unit 33 controls the flow rate, pressure, and the like of the raw material liquid supplied to the main body 22, and when a new raw material liquid is supplied into the main body 22, the raw material in the main body 22 The liquid is prevented from being pushed out from the discharge port 20a. The control amount for the raw material liquid control unit 33 can be changed as appropriate depending on the size of the discharge port 20a, the viscosity of the raw material liquid, and the like. The control amount for the raw material liquid control unit 33 can be obtained through experiments and simulations.
Moreover, the raw material liquid control part 33 can also switch the start of supply of a raw material liquid, and the stop of supply.

In addition, the supply part 32 and the raw material liquid control part 33 are not necessarily required. For example, if the storage unit 31 is provided at a position higher than the position of the main body 22, the raw material liquid can be supplied to the main body 22 using gravity. And the raw material liquid inside the main-body part 22 is prevented from being extruded from the discharge port 20a by setting the height position of the accommodating part 31 suitably. In addition, the height position of the accommodating part 31 can be suitably changed with the dimension of the discharge port 20a, the viscosity of a raw material liquid, etc. The height position of the storage unit 31 can be obtained by performing experiments and simulations.

The piping 34 is provided between the storage unit 31 and the supply unit 32, between the supply unit 32 and the raw material liquid control unit 33, and between the raw material liquid control unit 33 and the main body unit 22. The pipe 34 serves as a flow path for the raw material liquid. The pipe 34 is made of a material having resistance to the raw material liquid.

The power supply 4 applies a voltage to the nozzle 20 via the main body 22 and the connection part 21. A terminal (not shown) electrically connected to the plurality of nozzles 20 may be provided. In this case, the power supply 4 applies a voltage to the nozzle 20 via a terminal (not shown). That is, it is only necessary that a voltage can be applied from the power source 4 to the plurality of nozzles 20.

The polarity of the voltage (drive voltage) applied to the nozzle 20 can be positive or negative. However, if a negative voltage is applied to the nozzle 20, electrons are emitted from the tip of the nozzle 20, so abnormal discharge is likely to occur. Therefore, as shown in FIG. 1, the polarity of the voltage applied to the nozzle 20 is preferably positive.

The voltage applied to the nozzle 20 can be appropriately changed according to the type of the polymer substance contained in the raw material liquid, the distance between the nozzle 20 and the collecting body 51, and the like. For example, the power supply 4 can apply a voltage to the nozzle 20 so that the potential difference between the nozzle 20 and the collector 51 is 10 kV or more. In this case, if a plate-like nozzle is used, the voltage applied to the nozzle is about 70 kV. On the other hand, with the needle-like nozzle 20 according to the present embodiment, the voltage applied to the nozzle 20 can be reduced to 50 kV or less. Therefore, the drive voltage can be reduced.
The power source 4 can be a DC high voltage power source, for example. The power source 4 can output a DC voltage of 10 kV to 100 kV, for example.

The collection unit 5 includes a collection body 51, a deposition adjustment unit 52, and a power supply 53.
The collecting body 51 is provided on the side from which the raw material liquid of the plurality of nozzles 20 is discharged. The collector 51 is grounded. A voltage having a reverse polarity to the voltage applied to the nozzle 20 may be applied to the collecting body 51. The collector 51 can be formed from a conductive material. It is preferable that the material of the collecting body 51 has conductivity and resistance to the raw material liquid. The material of the collecting body 51 can be stainless steel, for example.

The collector 51 illustrated in FIG. 1 has a strip shape. One end of the collecting body 51 is provided on the rotating roller 51a, and the other end of the collecting body 51 is provided on the rotating roller 51b. A driving mechanism such as a motor is connected to the

rotating rollers

51a and 51b. The collector 51 can reciprocate between the pair of

rotating rollers

51a and 51b. In addition, you may make it the collection body 51 move between a pair of

rotating rollers

51a and 51b like a belt conveyor.

Further, the collecting body 51 may be a rotating drum, for example.
For example, the collecting body 51 may have a plate shape or a sheet shape and may not move. However, if the collector 51 is moved, a continuous deposition operation can be performed. Therefore, the production efficiency of the deposit 110 made of the fiber 100 can be improved.

The deposit 110 formed on the collector 51 is removed from the collector 51 by the operator. The deposit 110 is used for a nonwoven fabric, a filter, etc., for example. In addition, the use of the deposit 110 is not limited to the example illustrated.

Also, the collecting body 51 can be omitted. For example, the deposit 110 made of the fiber 100 can be directly formed on the surface of a member having conductivity. In such a case, the conductive member may be grounded, or a voltage having a polarity opposite to that applied to the nozzle 20 may be applied to the conductive member.

The accumulation adjusting unit 52 is provided on the side of the collecting body 51 opposite to the side on which the nozzle 20 is provided. The deposition adjusting unit 52 is made of a conductive material. The deposition adjusting unit 52 can be formed of a metal such as stainless steel, for example. The end of the accumulation adjusting unit 52 on the collecting body 51 side is pointed. If the end of the accumulation adjusting unit 52 on the collector 51 side is sharp, electric field concentration is likely to occur. Therefore, it becomes easy to form an electric field between the nozzle 20 and the deposition adjusting unit 52.

The power supply 53 applies a voltage to the deposition adjusting unit 52. The power supply 53 applies a voltage having a polarity opposite to the voltage applied to the nozzle 20 to the deposition adjusting unit 52. The power source 53 can be, for example, a DC high voltage power source. The power supply 53 can output a DC voltage of 10 kV or more and 100 kV or less, for example.

When a voltage having a polarity opposite to the voltage applied to the nozzle 20 is applied to the deposition adjusting unit 52, an electric field is also formed between the nozzle 20 and the deposition adjusting unit 52. The electric field formed between the nozzle 20 and the collecting body 51 changes under the influence of the electric field formed between the nozzle 20 and the deposition adjusting unit 52. The raw material liquid in the vicinity of the discharge port 20a of the nozzle 20 is drawn out by the electrostatic force acting along the lines of electric force. Therefore, if the electric field formed between the nozzle 20 and the collecting body 51 is changed, the region where the fiber 100 is deposited can be changed. That is, the deposition adjusting unit 52 changes the region where the fiber 100 is deposited by changing the electric field formed between the nozzle 20 and the collector 51.

If the deposition adjusting unit 52 and the power source 53 are provided, it becomes easy to deposit the fiber 100 in the region to be deposited. Further, if the deposition adjusting unit 52 and the power source 53 are provided, the thickness of the deposited body 110 can be made uniform, the fiber 100 can be deposited locally, and the opening portion such as a pinhole formed in the deposited body 110 can be repaired. It can be carried out.

In addition, by controlling the voltage applied to the deposition adjusting unit 52, the electric field formed between the nozzle 20 and the deposition adjusting unit 52, and consequently, the electric field formed between the nozzle 20 and the collector 51 is controlled. be able to.

In addition, a driving device (not shown) that moves the deposition adjusting unit 52 can be provided. If the deposition adjustment unit 52 is moved, the electric field can be controlled more easily.
1 is provided for each of the plurality of nozzles 20 belonging to the first nozzle group 12a and the plurality of nozzles 20 belonging to the second nozzle group 12b. It has been. Note that only one set of the deposition adjusting unit 52 and the power source 53 may be provided, or only one power source 53 may be provided for the plurality of deposition adjusting units 52.

The control unit 6 controls the operation of the drive unit connected to the supply unit 32, the raw material liquid control unit 33, the power source 4, the power source 53, and the

rotating rollers

51a and 51b. The control unit 6 can be, for example, a computer having a CPU (Central Processing Unit) and a memory.

Next, the operation of the electrospinning apparatus 1 will be described.
The raw material liquid remains in the vicinity of the discharge port 20a of the nozzle 20 due to surface tension.
The power source 4 applies a voltage to the nozzle 20. Then, the raw material liquid in the vicinity of the discharge port 20a is charged with a predetermined polarity. In the case illustrated in FIG. 1, the raw material liquid in the vicinity of the discharge port 20a is positively charged.

Since the collecting body 51 is grounded, an electric field is formed between the nozzle 20 and the collecting body 51. When the electrostatic force acting along the lines of electric force becomes larger than the surface tension, the raw material liquid in the vicinity of the discharge port 20a is drawn toward the collector 51 by the electrostatic force. The drawn raw material liquid is stretched and the fiber 100 is formed by volatilization of the solvent contained in the raw material liquid. The formed fiber 100 is deposited on the collection body 51, whereby the deposition body 110 is formed. Further, by controlling at least one of the voltage applied to the deposition adjusting unit 52 and the position of the deposition adjusting unit 52, the region in which the fiber 100 is deposited can be changed.

As mentioned above, although some embodiment of this invention was illustrated, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. Further, the above-described embodiments can be implemented in combination with each other.

Claims

A main body having a space in which the raw material liquid can be stored, and
A first nozzle group connected to the main body and including at least one nozzle;
A second nozzle group connected to the main body and including at least one nozzle;
With
The nozzle head belonging to the second nozzle group extends in a direction away from the nozzle belonging to the first nozzle group as viewed from a direction in which the main body extends.
The nozzle head according to claim 1, wherein the nozzle belonging to the first nozzle group and the nozzle belonging to the second nozzle group are detachably connected to the main body.
The distance projected in the direction in which the main body extends between the tip of the nozzle belonging to the first nozzle group and the tip of the nozzle belonging to the second nozzle group, as viewed from the direction in which the main body extends. The nozzle head according to claim 1, wherein is longer than a cross-sectional dimension of the main body.
When viewed from the direction in which the main body extends, the projection is performed in the direction in which the main body extends between the direction in which the nozzles belonging to the first nozzle group extend and the direction in which the nozzles belonging to the second nozzle group extend. The nozzle head according to any one of claims 1 to 3, wherein the angle is not less than 30 ° and not more than 150 °.
The nozzle further belonging to the first nozzle group, the nozzle belonging to the second nozzle group, and a connection portion provided between the main body portion, and
The nozzle head according to any one of claims 1 to 4, wherein the connection portion is connected to the main body portion using a screw or a luer taper.
The nozzle head according to any one of claims 1 to 5, wherein the nozzle belonging to the first nozzle group and the nozzle belonging to the second nozzle group have a needle shape or a cone shape.
The first nozzle group includes a plurality of nozzles arranged side by side in a direction in which the main body portion extends,
The nozzle head according to any one of claims 1 to 6, wherein the second nozzle group includes a plurality of nozzles arranged side by side in a direction in which the main body portion extends.
Nozzle head according to any one of claims 1 to 7,
A raw material liquid supply unit capable of supplying the raw material liquid to the nozzle head;
A power source capable of applying a voltage of a predetermined polarity to the nozzle head;
An electrospinning apparatus comprising: