KR101052124B1 - An apparatus for manufacturing nano-fiber and the method for manufacturing nano-fiber - Google Patents

Abstract

PURPOSE: A nanofiber manufacturing device and a nanofiber manufacturing method are provided to possibly stop ventilation variations in a predetermined range by appropriately controlling a transfer speed. CONSTITUTION: The nanofiber manufacturing device and the nanofiber manufacturing method include a transfer apparatus; a spinning device; a measuring apparatus for ventilation; and a control device. The transfer apparatus(10) transfers the elongated sheet with a predetermined transfer speed. The spinning device sediments nanofiber in the elongated sheet transferred by the transfer apparatus. The measuring apparatus for ventilation(40) measures the ventilation of the elongated sheet sedimenting nanofiber with the spinning device. The control device(50) of transfer speed controls transfer speed on a basis of the ventilation measured by the measuring apparatus for ventilation.

Description

An Apparatus for manufacturing nano-fiber And The method for manufacturing nano-fiber}

The present invention relates to a nanofiber production apparatus and a nanofiber production method.

Conventionally, nanofibers having uniform physical properties are produced by adjusting the spinning conditions (for example, the presence or absence of suspended solids in the spinning zone, the distance between the nozzle block and the collector, the structure of the collector, etc.) in the field spinning process. A nanofiber production method that can be used is known (hereinafter referred to as "Patent Document 1").

FIG. 12: is a figure for demonstrating the nanofiber manufacturing apparatus 900 used for the nanofiber manufacturing method of patent document 1. As shown in FIG. In Fig. 12, numeral 910 denotes a nozzle block, numeral 912 denotes a nozzle, numeral 920 denotes a blower, numeral 922 denotes a wind direction control plate, numeral 924 denotes an edge member, and numeral 926 denotes a suction device. , 928 denotes a fan, and 950 denotes a collector.

In the nanofiber production method described in Patent Document 1, for example, as shown in FIG. 12, an air flow is formed in a spinning zone including a blower 920, two edge members 924, and a suction device 926. By removing the volatilized solvent or suspended impurities, the spinning conditions in the field emission process are adjusted.

According to the nanofiber production method described in Patent Literature 1, since it is possible to manufacture nanofibers having uniform physical properties by adjusting the spinning conditions in the field spinning process, a nanofiber nonwoven fabric having a uniform air permeability is produced. It can be considered that it is possible to manufacture.

However, even if it has the nanofiber manufacturing method of patent document 1, in reality, since it is not easy to keep constant the spinning conditions in an electric field spinning process for a long time, the nanofiber nonwoven fabric which has a uniform air permeability is bulky. It is a fact that it is difficult to produce. Such a situation also applies to a nanofiber production method for producing nanofibers by a melt blow spinning device or other spinning devices.

Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a nanofiber manufacturing apparatus and a nanofiber manufacturing method capable of mass-producing a nanofiber nonwoven fabric having a uniform air permeability.

The nanofiber manufacturing apparatus of the present invention includes a conveying apparatus for conveying a long sheet at a predetermined conveying speed, a spinning apparatus for depositing nanofibers on a long sheet being conveyed by the conveying apparatus, and a nanofiber by the spinning apparatus. It is characterized in that it comprises a ventilation device for measuring the ventilation of the long sheet is deposited, and a feed rate control device for controlling the conveying speed based on the ventilation measured by the ventilation device.

In the nanofiber manufacturing apparatus of the present invention, it is preferable that the feed rate control device controls the feed rate based on a deviation amount between the air permeability measured by the air permeability measuring device and a predetermined target air permeability.

In the nanofiber manufacturing apparatus of the present invention, it is preferable that the feed rate control device controls the feed rate in consideration of the time change rate of the deviation amount.

In the nanofiber manufacturing apparatus of the present invention, the air permeability measuring device includes a air permeability measuring unit for measuring the air permeability of the long sheet, and a drive unit for reciprocating the air permeability measuring unit at a predetermined cycle along the width direction of the long sheet. It is preferable.

In the nanofiber manufacturing apparatus of the present invention, the feed rate control device averages the air permeability measured by the air permeability measurement unit at a time corresponding to the predetermined period or n times the corresponding period (where n is a natural number). It is preferable to control the conveying speed based on the average air permeability obtained.

In the nanofiber manufacturing apparatus of the present invention, the air permeability measuring device is a air permeability measuring device for measuring the air permeability of the long sheet, and has a plurality of air permeability measuring units disposed at a plurality of positions in the width direction of the long sheet. It is desirable to.

In the nanofiber manufacturing apparatus of the present invention, it is preferable that the feed rate control device controls the feed rate based on an average air permeability obtained by averaging the air permeability measured by the plurality of air permeability measuring units.

In the nanofiber manufacturing apparatus of the present invention, it is preferable to further include a heating device which is arranged between the spinning device and the air permeability measuring device and heats the long sheet in which the nanofibers are deposited.

In the nanofiber manufacturing apparatus of the present invention, it is preferable that the spinning device includes a plurality of spinning devices arranged in series along a predetermined conveying direction in which the long sheet is transported.

In the nanofiber manufacturing apparatus of the present invention, the spinning device is preferably an electric field spinning device.

The nanofiber manufacturing method of the present invention measures the air permeability of the long sheet in which the nanofibers are deposited while depositing the nanofibers on the long sheet being conveyed at a predetermined feed rate, and based on the air permeability of the long sheet. The long sheet is characterized by controlling the feed rate.

According to the nanofiber manufacturing apparatus of the present invention, it is possible to control the feed rate on the basis of the air permeability measured by the air permeability measuring device. By appropriately controlling the feed rate, it is possible to stop the fluctuation amount of the air permeability in a predetermined range, and as a result, it becomes possible to mass-produce the nanofiber nonwoven fabric having a uniform air permeability.

For example, in the case where the spinning condition changes in the direction of increasing the air permeability during the long-term field emission process, the air permeability is reduced by decreasing the feed rate and increasing the amount of nanofibers deposited per unit area to reduce the air permeability. The value of can be stopped within a predetermined range. In addition, when the radiation conditions fluctuate in the direction of decreasing the air permeability during a long period of electric field radiation, the air permeability is increased by decreasing the amount of nanofibers per unit area by slowing the feed rate. It becomes possible to stop at the range.

And, by adjusting the radiation conditions such as "concentration of the polymer solution" and "temperature and humidity in the radiation zone", it is possible to stop the value of the air permeability in a predetermined range, but in these cases, fluctuations in the air permeability Since it takes a certain time to adjust the spinning conditions in accordance with this, it is difficult to produce a nanofiber nonwoven fabric having a uniform air permeability along the long direction with high productivity.

In addition, by adjusting the radiation conditions such as "gap between nozzle and collector", "voltage applied between nozzle and collector", it is also possible to stop the value of air permeability in a predetermined range. The physical properties of the nanofibers, such as the diameter of the nanofibers, the density of the nanofiber layer, and fluctuate, and it is difficult to produce a nanofiber nonwoven fabric having uniform physical properties.

On the other hand, according to the nanofiber manufacturing apparatus of the present invention, it is possible to mass-produce a nonwoven fabric having a uniform air permeability by a simple method of controlling the feed rate based on the air permeability measured by the air permeability measuring device. Therefore, there is no problem that it takes a certain time to adjust the spinning conditions in accordance with the fluctuation of the ventilation, and there is no problem that the physical properties of the nanofibers, such as the diameter of the nanofibers, the density of the nanofiber layer, and the like.

In the present invention, the air permeability of the long sheet in which the nanofibers are deposited refers to the air permeability in the case of measuring the air permeability in the state in which the nanofiber layer deposited on the long sheet and the long sheet are laminated. In addition, a nanofiber nonwoven fabric refers to the thing of the elongate sheet | seat in which the nanofiber was deposited. The nanofiber nonwoven fabric may be a product as it is, or a long sheet is removed from the nanofiber nonwoven fabric to produce a "nonwoven fabric consisting of only a nanofiber layer", which may be used as a product. In addition, a "nano fiber" consists of a polymer and shall be a thing of the fiber of several nm-several thousand nm in average diameter. In addition, a "polymer solution" means the thing of the solution which melt | dissolved the polymer in the solvent.

According to the nanofiber manufacturing apparatus of the present invention, for example, when the deviation amount is large, the control amount (change amount from the initial value) of the feed rate is increased, and when the deviation amount is small, the control amount ( Since it becomes possible to control that the amount of change from the initial value) is made small, it is possible to appropriately control the feed speed in accordance with the degree of fluctuation of the ventilation.

According to the nanofiber production apparatus of the present invention, for example, when the deviation amount is less than the predetermined value, the feed rate is not changed from the initial value, and when the deviation amount is more than the predetermined value, the feed rate is initialized. Since it becomes possible to control to change from a value, it becomes possible to simplify control of a feed rate by a feed rate control apparatus.

In the nanofiber manufacturing apparatus of the present invention, the feed rate control device controls the feed rate in consideration of the time change rate of the deviation amount, and thus, based on only the deviation amount by considering the "time change rate of the deviation amount". In comparison with the case of controlling the feed rate, the feed rate can be controlled more appropriately. For example, in the case where the spinning condition is made to fluctuate rapidly, the time change rate of the deviation amount is large, so that the control amount (change amount from the initial value) of the feed rate is increased to match it. In addition, when the variation amount of the spinning condition is small, since the rate of change of the variation amount is small, the control amount (change amount from the initial value) of the feed rate is made small to match it.

In the nanofiber manufacturing apparatus of the present invention, it is possible to measure the air permeability over a wide area in the width direction of the long sheet, and it is possible to control the feed rate more appropriately.

In the nanofiber manufacturing apparatus of the present invention, even when the air flow rate is distributed in the width direction of the long sheet, the feed rate can be controlled more appropriately by controlling the feed rate based on the average air permeability.

In the nanofiber manufacturing apparatus of the present invention, as in the case of the nanofiber manufacturing apparatus according to claim 4, it is possible to measure the air permeability over a wide area in the width direction of the long sheet, and to control the feed rate more appropriately. It becomes possible.

In the nanofiber production apparatus of the present invention, as in the case of the nanofiber production apparatus according to claim 5, the feed rate is controlled on the basis of the average air permeability even when the air permeability is distributed in the width direction of the long sheet. By doing so, it becomes possible to control the feed rate more appropriately.

In the nanofiber production apparatus of the present invention, since it is possible to completely evaporate a solvent remaining in the nanofiber layer, it is possible to produce a high quality nanofiber nonwoven fabric with a very small amount of residual solvent. In addition, since the air permeability can be measured while the solvent is completely evaporated, it is possible to accurately measure the air permeability.

In the nanofiber manufacturing apparatus of the present invention, it is possible to sequentially deposit nanofibers on a long sheet in each of a plurality of spinning apparatuses, thereby mass-producing a nanofiber nonwoven fabric having a uniform air permeability with higher productivity. It becomes possible. In addition, even when mass-producing a nanofiber nonwoven fabric in which various types of nanofibers are sequentially deposited on a long sheet, it is possible to mass-produce a nanofiber nonwoven fabric having a uniform air permeability with higher productivity. In addition, even in a nanofiber manufacturing apparatus having a plurality of spinning devices, in each of the plurality of spinning devices, mass production of nanofiber nonwoven fabrics having a uniform air permeability is achieved only by controlling the feeding speed rather than adjusting the spinning conditions. It becomes possible.

In the nanofiber production apparatus of the present invention, a nanofiber production apparatus having a uniform air permeability even in a nanofiber production apparatus having an electric field emission value capable of producing a nanofiber having an extremely thin diameter (a few nm to several thousand nm) as a spinning device. It becomes possible to mass-produce a fiber nonwoven fabric.

According to the nanofiber manufacturing method of the present invention, since the air permeability of the long sheet in which the nanofibers are deposited is measured and the feeding speed of the long sheet is controlled based on the air permeability, the spinning process is performed in a long time field emission process. Even if the conditions vary and the airflow varies, it is possible to stop the fluctuation amount of the airflow within a predetermined range by appropriately controlling the feed rate, and as a result, it becomes possible to mass-produce a nonwoven fabric having a uniform airflow. .

According to the nanofiber manufacturing apparatus or the nanofiber manufacturing method of the present invention, medical products such as high-performance and highly sensitive textiles, cosmetic-related products such as healthcare, skin care, industrial materials such as wiping cloth, filters, and secondary batteries Medical materials such as electronic and mechanical materials such as separators, separators of capacitors, carriers of various catalysts, various sensor materials, regenerative medical materials, biomedical materials, medical MEMS materials and biosensor materials, and a wide range of other applications. Nanofibers that can be used can be prepared.

1 is a view for explaining a nanofiber manufacturing apparatus according to the embodiment.
Fig. 2 is an enlarged view of the main portion of the field emission device according to the embodiment.
3 is a block diagram of an essential part of a nanofiber production apparatus according to Example 1. FIG.
4 is a flowchart for explaining a method of manufacturing nanofibers.
5 is a view for explaining the movement of the air permeability measuring unit.
6 is a graph showing the time change of the air permeability P, the average air permeability <P> and the feed rate (V).
FIG. 7 is a graph showing the time change of the air permeability P, the average air permeability <P>, and the feed rate V in the modification 1. FIG.
8 is a flowchart for explaining a nanofiber manufacturing method in modified example 2. FIG.
Fig. 9 is a graph showing the time variation of the air permeability P, the average air permeability <P>, and the feed rate V in the second modification.
It is a figure which shows the structure of the air permeability measurement part in Example 2. FIG.
11 is an enlarged view illustrating main parts of the field emission device.
It is a figure for demonstrating the nanofiber manufacturing apparatus used for the nanofiber manufacturing method of patent document 1. As shown in FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the nanofiber manufacturing apparatus and nanofiber manufacturing method of this invention are demonstrated based on the Example shown in drawing.

Example 1

1. Configuration of Nanofiber Manufacturing Apparatus 1 according to Example 1

FIG. 1: is a figure for demonstrating the nanofiber manufacturing apparatus 1 which concerns on an Example. 1 (a) is a front view of the nanofiber manufacturing apparatus 1, Figure 1 (b) is a plan view of the nanofiber manufacturing apparatus (1). In addition, in FIG. 1, the drawing of the polymer solution supply part and the polymer solution recovery part is abbreviate | omitted. In addition, in FIG.1 (a), some member is shown by the enlarged part of a main part. 2 is an enlarged view of the main portion of the field emission device 20.

As shown in FIGS. 1 and 2, the nanofiber manufacturing apparatus 1 according to the first embodiment includes a conveying apparatus 10 for conveying a long sheet W at a predetermined conveying speed V, and a conveying apparatus 10. Measures the air permeability (P) of the field radiating device (20) for depositing nanofibers on the long sheet (W) conveyed by the sheet) and the long sheet (W) for depositing nanofibers by the field radiating device (20). The air permeability measuring apparatus 40 and the feed speed control apparatus 50 which controls the feed rate V based on the air permeability P measured by the air permeability measuring apparatus 40 are provided.

In the nanofiber manufacturing apparatus 1 according to Example 1, as the electric field radiating apparatus, four electric field radiating apparatuses 20 arranged in series along a predetermined conveying direction a to which the long sheet W is conveyed are provided. It is provided.

The nanofiber manufacturing apparatus 1 according to Example 1 is disposed between the electric field radiating apparatus 20 and the air permeability measuring apparatus 40, and a heating apparatus 30 for heating the long sheet W on which the nanofibers are deposited. ), "The conveying apparatus 10, the electric field radiating apparatus 20, the heating apparatus 30, the air permeability measuring apparatus 40, the feed rate control apparatus 50, the VOC processing apparatus 70 mentioned later, and a polymer supply apparatus And a main control device 60 for controlling the operation of the &quot; polymer recovery device &quot; and a VOC processing device 70 for burning and removing volatile components generated when the nanofibers are deposited on the long sheet W.

The conveying apparatus 10 is located between the feeding roller 11 which throws in the long sheet W, the winding roller 12 which winds the long sheet W, and between the feeding roller 11 and the winding roller 12. Auxiliary rollers 13 and 18 and drive rollers 14, 15, 16 and 17. The input roller 11, the winding roller 12, and the drive rollers 14, 15, 16, and 17 are structured to rotate by a drive motor not shown.

As shown in FIG. 2, the electric field radiator 20 is mounted to the case 100 via an insulating member 152 and is disposed at one side of the long sheet W. And a plurality of nozzles located at positions facing the collector 150 on the other surface side of the long sheet W, and for injecting a polymer solution supplied from a polymer solution supply unit (not shown) toward the long sheet W; A power supply unit 160 for applying a high voltage (for example, 10 kV to 80 kV) between the nozzle block 110 having the nozzle block 110, the collector 150, and the nozzle block 110, and the collector 150 and the nozzle block. An electric field radiation chamber (102) for determining a predetermined space covering the (110) and an auxiliary belt device (170) for assisting the long sheet (W) are conveyed. The positive electrode of the power supply device 160 is connected to the collector 150, and the negative electrode of the power supply device 160 is connected to the nozzle block 110 through the case 100.

As shown in FIG. 2, the nozzle block 110 has a plurality of nozzles, each having a plurality of upward nozzles for discharging the polymer solution upward from the discharge port. The nanofiber manufacturing apparatus 1 discharges the polymer solution from the discharge ports of the plurality of upward nozzles while radiating the polymer solution from the discharge ports of the plurality of upward nozzles, thereby electrospinning the nanofibers, and from the discharge ports of the plurality of upward nozzles. It is comprised so that the overflowed polymer solution can be collect | recovered and recycled as a raw material of a nanofiber. The some upward nozzle 112 is arrange | positioned at the pitch of 1.5 cm-6.0 cm, for example. The number of the plurality of upward nozzles 112 is, for example, 36 (6 * 6 when arranged in the same number in the vertical) to 21904 (148 * 148 when arranged in the same number in the vertical) to be. In addition, although the nozzle block having various sizes and various shapes can be used for the nanofiber manufacturing apparatus of the present invention, the nozzle block 110 includes, for example, a rectangle (square) of 0.5m to 3m on one side when viewed from the top surface. Size and shape.

As shown in FIG. 2, the auxiliary belt device 170 includes five auxiliary belt rollers that assist the rotation of the auxiliary belt 172 and the auxiliary belt 172 which rotates in synchronization with the feeding speed of the long sheet W. As shown in FIG. Has (174). One of the five subbelt rollers 174 or two or more subbelt rollers 174 is a driving roller, and the remaining subbelt rollers are driven rollers. Since the auxiliary belt 172 is disposed between the collector 150 and the long sheet W, the long sheet W is smoothly conveyed without being pulled by the collector 150 to which a positive high voltage is applied. .

The heating device 30 is disposed between the electric field radiator 20 and the air permeability measuring device 40 to heat the long sheet W on which the nanofibers are deposited. The heating temperature varies depending on the type of the long sheet W or the nanofibers, but for example, the long sheet W can be heated to a temperature of 50 ° C to 300 ° C.

As shown in FIG. 3, the air permeability measuring device 40 measures the air permeability measuring unit 41 for measuring the air permeability P of the long sheet W, and the air permeability measuring unit 41 along the width direction of the long sheet W. As shown in FIG. The control unit 44 which controls the operation of the drive unit 43 and the drive unit 43 and the air permeability measuring unit 41 which reciprocate at a predetermined period T, and receives and processes the measurement result from the air permeation measuring unit 41. It is provided. The drive part 43 and the control part 44 are arrange | positioned at the main body part 42. As shown in FIG. As the air permeability measuring device 40, for example, a general air permeability measuring device can be used.

The air permeability measuring device 40 may transmit the value of the measured air permeability P to the feed rate control device 50 as it is, and the measured air permeability P may be transmitted in a predetermined period T or a corresponding period T. The average air permeability <P> obtained by averaging at times corresponding to n times (where n is a natural number) may be transmitted to the feed rate control device 50.

The feed rate control device 50 is a feed rate V of the long sheet W conveyed by the feed device 10 based on the air permeability P measured by the air permeability measurement unit 40 or the average air permeability <P>. ). For example, if the spinning conditions fluctuate in the direction of increasing the air permeability (P) during the long-term field emission process, the air permeability is reduced by increasing the deposition amount of nanofibers per unit area by slowing the feed rate (V). . On the other hand, in the case where the spinning conditions change in the direction of decreasing the air permeability during the long-term field emission process, the air permeability is increased by reducing the amount of nanofibers deposited per unit area by increasing the feed rate. And the control of the feed rate V can be performed by controlling the rotation speed of the drive rollers 14, 15, 16, 17. FIG.

The VOC processing apparatus 70 burns and removes volatile components generated when the nanofibers are deposited on the long sheet.

The main control device 60 is a conveying device 10, electric field radiation device 20, heating device 30, air permeability measuring device 40, feed rate control device 50, VOC processing device 70, polymer supply device And control the operation of the polymer recovery device.

2. Nanofibers manufacturing method using nanofibers manufacturing apparatus 1 according to Example 1

Hereinafter, the method (nanofiber manufacturing method concerning Example 1) which manufactures a nanofiber nonwoven fabric using the nanofiber manufacturing apparatus 1 which concerns on Example 1 comprised as mentioned above is demonstrated.

4 is a flowchart for explaining a nanofiber production method according to Example 1. FIG. 5 is a diagram for explaining the movement of the air permeability measurement unit 41. 5 (a) to 5 (f) are respective process charts. In FIG. 5, the curve represented by the sinusoidal curve is a trajectory for the air-permeability measurement unit 41 to tie the portion where the air-permeability is measured on the long sheet W. As shown in FIG.

6 is a graph showing the time change of the air permeability P, the average air permeability <P>, and the feed rate V. FIG. Figure 6 (a) is a graph showing the time change of the air permeability (P), Figure 6 (b) is a graph showing the time change of the average ventilation <P>, Figure 6 (c) is the time of the feed rate (V) Graph showing change. In Figs. 6 (a) and 6 (b), the symbol Po represents the target ventilation, the symbol PH represents the upper limit of the allowable ventilation, and the symbol PL represents the lower limit of the allowable ventilation. In FIG.6 (c), the code Vo shows the initial value of a feed rate.

As shown in FIG. 4, the nanofiber manufacturing method according to Example 1 is a "feeding speed of" long sheet conveyance and electric field radiation "," measuring air permeability "," average air permeability calculation ", and" calculation of deviation (ΔP) ". Control ".

1. Transfer of long sheet, electric field radiation (S10)

Each long electric field W is set in the conveying apparatus 10, and each long electric field W is conveyed from the feeding roller 11 toward the winding roller 12 at the predetermined conveying speed V, In the spinning device 20, nanofibers are sequentially deposited on the elongated sheet (W). Thereafter, the long sheet W having the nanofibers deposited thereon is heated by the heating device 30. As a result, a nanofiber nonwoven fabric made of a long sheet in which nanofibers are deposited is produced.

At this time, the air permeability P of the long sheet W in which the nanofibers were deposited by the electric field radiator 20 was measured by the following procedure, and the air permeability P measured by the air permeability measuring device 40 was measured. The feed rate (V) is controlled based on In Example 1, as shown in Figs. 6 (a) to 6 (c), the feed rate is not controlled for the period before time t passes, and the period after time t passes. The feed rate is controlled. The same applies to Modifications 1 and 2 described below.

2. Air permeability measurement (S12)

First, as shown in Figs. 5 (a) to 5 (f), the air permeability measurement unit 41 reciprocates in a predetermined period T (for example, 1 second) along the width direction of the long sheet W. While measuring the air permeability of the long sheet (W). The air permeability measurement by the air permeability measurement unit 41 is performed every 10 ms, for example. As a result, a graph as shown in Fig. 6A is obtained.

3. Calculation of average aeration (S14)

Subsequently, the average air permeability <P> is calculated by averaging the air permeability P measured by the air permeability measurement unit 41 at a predetermined period T (for example, 1 second). As a result, a graph as shown in Fig. 6B is obtained.

4. Calculation of deviation (ΔP) (S16)

Subsequently, the deviation amount DELTA P between the above average air permeability <P> and the predetermined target air permeability Po is calculated.

5. Feed speed control (S18 ~ S24)

Next, the feed rate V is controlled based on the deviation amount ΔP.

For example, when the radiation conditions fluctuate in the direction of increasing the air permeability (P) in the long-term field emission process (when the amount of deviation (ΔP) is positive), the feed rate (V) is delayed to lower the per unit area. The air permeability is reduced by increasing the amount of nanofibers deposited. On the other hand, when the radiation conditions fluctuate in the direction of decreasing the air permeability in the long-term field emission process (when the deviation amount (ΔP) is denied), the amount of nanofibers deposited per unit area is increased by increasing the feed rate (V). Increase the air permeability by reducing (see Fig. 6 (c)). Accordingly, after time t passes, the air permeability P gradually converges to a predetermined target air permeability Po value.

Below, the spinning conditions in the nanofiber manufacturing method concerning Example 1 are shown by way of example.

As the long sheet, a nonwoven fabric, a woven fabric, a knitted fabric, etc. made of various materials can be used. As for the thickness of a long sheet, the thing of 5 micrometers-500 micrometers can be used, for example. The length of the long sheet may be, for example, 10 m to 10 km.

As a polymer used as a raw material of a nanofiber, For example, polylactic acid (PLA), polypropylene (PP), polyvinyl acetate (PVAc), polyethylene terephthalate (PET), polyethylene terephthalate (PBT), polyethylene na Phthalate (PEN), Polyamide (PA), Polyurethane (PUR), Polyvinyl Alcohol (PVA), Polyacrylonitrile (PAN), Polyethylimide (PEI), Polycaprolactone (PCL), Polylactic acid glyc Rollic acid (PLGA), silk, cellulose, chitosan and the like can be used.

As a solvent used for a polymer solution, dichloromethane, dimethylformamide, dimethyl sulfoxide, methyl ethyl ketone, chloroform, acetone, water, formic acid, acetic acid, cyclohexane, THF, etc. can be used, for example. You may mix and use multiple types of solvent. The polymer solution may contain additives such as conductivity improvers.

Air permeability (P) of the nanofiber nonwoven fabric produced, for example, can be set to ^{0.15cm 3 / cm 2 / s~200cm 3} / cm 2 / s. The feed speed can be set to, for example, 0.2 m / min to 100 m / min. The voltage applied to the nozzle, the collector 150, and the nozzle block 110 can be set at 10 kV to 80 kV, and is preferably set at around 50 kV.

The temperature of a spinning zone can be set to 25 degreeC, for example. The humidity of the radiation zone can be set to 30%, for example.

3. Effect of the nanofiber manufacturing apparatus 1 according to Example 1

According to the nanofiber manufacturing apparatus 1 of Example 1, the air permeability measuring device 40 which measures the air permeability P of the elongate sheet W which deposited the nanofiber by the spinning apparatus 20, and the air permeability measurement Since the feed rate control device 50 controls the feed rate V based on the air permeability P measured by the device 40, the feed rate is based on the air permeability measured by the air permeation measuring device. It becomes possible to control. For this reason, even if the ventilation conditions change due to fluctuating radiation conditions in the long-term field emission process, it is possible to stop the fluctuation amount of the ventilation in a predetermined range by appropriately controlling the feed rate accordingly. It becomes possible to mass-produce the nanofiber nonwoven fabric which has.

In addition, according to the nanofiber manufacturing apparatus according to Example 1, the feed rate (based on the deviation amount? P between the air permeability P measured by the air permeability measuring device 40 and the predetermined target air permeability Po) In order to control V), for example, in the case where the deviation amount ΔP is large, the control amount (change amount from the initial value Vo) of the feed rate V is increased, and the deviation amount ΔP is increased. In the case of being small, it is possible to control so as to reduce the control amount (change amount from the initial value Vo) of the feed rate V, and it is possible to appropriately control the feed rate in accordance with the degree of fluctuation of the ventilation.

Moreover, according to the nanofiber manufacturing apparatus 1 which concerns on Example 1, the air permeability measuring device 40 measures the air permeability measurement part 41 which measures the air permeability P of the long sheet W, and the air permeability measurement part 41 is carried out. Since the drive part 43 which reciprocates at the predetermined period T along the width direction of the elongate sheet W is provided, it becomes possible to measure the air permeability over the wide range of the elongate sheet W in the width direction. It is possible to appropriately control the feed rate.

Moreover, according to the nanofiber manufacturing apparatus 1 which concerns on Example 1, the feed rate control apparatus 50 makes the air permeability P measured by the air permeability measurement part 40 the predetermined period T and the said period ( Since the feed rate V can be controlled based on the average air permeability <P> obtained by averaging at a time corresponding to n times T), where n is a natural number, the width direction of the long sheet W is wide. In any case, even if the distribution is in the air permeability P, the feed rate V can be more appropriately controlled by controlling the feed rate V based on the average air permeability <P>.

Moreover, according to the nanofiber manufacturing apparatus 1 concerning Example 1, the electric field radiating apparatus 20 and the ventilation system are arrange | positioned between the measuring apparatus 40, and the heating which heats the elongate sheet W which deposited the nanofibers is heated. Since the apparatus 30 is additionally provided, since the solvent remaining in the nanofiber layer can be completely evaporated, the amount of remaining solvent is extremely small and a high quality nanofiber nonwoven fabric can be produced. In addition, since the air permeability P can be measured while the solvent is completely evaporated, the air permeability can be measured accurately.

In addition, according to the nanofiber manufacturing apparatus 1 according to the first embodiment, the electric field radiating apparatus includes a plurality of electric field radiating apparatuses arranged in series along a predetermined conveying direction a in which the long sheet W is conveyed ( 20), it is possible to sequentially deposit nanofibers on the long sheet W in each of the plurality of electric field radiating devices 20, and further increase the productivity of the nanofiber nonwoven fabric having a uniform air permeability. It is possible to mass-produce. Further, even when mass-producing a nanofiber nonwoven fabric in which various kinds of nanofibers are sequentially deposited on the long sheet W, it is possible to mass-produce a nanofiber nonwoven fabric having a uniform air permeability with higher productivity. In addition, in the nanofiber manufacturing apparatus provided with the plurality of electric field radiating devices 20, in each of the plurality of electric field radiating devices 20, only the feed rate V is controlled without adjusting the spinning conditions. It becomes possible to mass-produce nanofiber nonwoven fabrics having one air permeability.

Moreover, according to the nanofiber manufacturing apparatus 1 which concerns on Example 1, the nanofiber manufacturing apparatus provided with the field emission value which can manufacture the nanofiber which has extremely thin diameter (a few nm-several thousand nm) as a spinning device. In addition, it becomes possible to mass-produce a nanofiber nonwoven fabric having a uniform air permeability.

According to the nanofiber manufacturing apparatus 1 according to Example 1, the nanofibers are deposited on the long sheet W being conveyed at a predetermined conveying speed V, and the nanofibers are deposited on the long sheet W. Since the air permeability (P) is measured and the feed rate (V) of the long sheet (W) is controlled based on the air permeability (P) of the long sheet (W). Even if the air permeability fluctuates due to this fluctuation, it is possible to stop the fluctuation amount of the air permeability in a predetermined range by appropriately controlling the feed rate, and as a result, it becomes possible to mass-produce a nanofiber nonwoven fabric having a uniform air permeability.

[Modification 1]

Fig. 7 is a graph showing the time change of the air permeability P, the average air permeability <P> and the feed rate V in the first modification. 7 (a) is a graph showing the time change of the air permeability (P), Figure 7 (b) is a graph showing the time change of the average ventilation <P>, Figure 7 (c) is the time of the feed rate (V) Graph showing change. 7 (a) and 7 (b), the symbol Po denotes a target ventilation, the symbol PH denotes an upper limit of allowable ventilation, and the symbol PL denotes a lower limit of allowable ventilation. In FIG.7 (c), the code Vo shows the initial value of a feed rate.

In the modification 1, as is also seen from Fig. 7 (c), the feed rate V is controlled in a stepped shape. Thus, even in the case of controlling the feed rate V in a stepped shape, as shown in Figs. 7A and 7B, the air permeability P and the average air permeability <P are the same as those in the first embodiment. It is possible to converge> to the target aeration.

[Modified example 2]

8 is a flowchart for explaining a nanofiber production method according to Modification Example 2. FIG. Fig. 9 is a graph showing the time change of the air permeability P, the average air permeability <P> and the feed rate V in the second modification. 9 (a) is a graph showing the time change of the air permeability (P), Figure 9 (b) is a graph showing the time change of the average ventilation <P>, Figure 9 (c) is a time of the feed rate (V) Graph showing change. 9 (a) and 9 (b), the symbol Po represents the target ventilation, the symbol PH represents the upper limit of the allowable ventilation, the symbol PL represents the lower limit of the allowable ventilation, and the symbol PH1 represents the upper control start ventilation. Indicates a lower control start ventilation. In Fig. 9C, the symbol Vo represents the initial value of the feed rate.

In the method of manufacturing the nanofiber according to the modification 2, as can be seen from Figs. 8 and 9, when the average ventilation <P> is higher than the upper control starting ventilation (PH1) or lower than the lower control starting ventilation (PL1). Therefore, the feed rate V is controlled (changed from the initial value). Even in the case of performing such a control, as shown in Figs. 9A and 9B, the air permeability P and the average air permeability <P> are set to the target air permeability Po as in the case of the first embodiment. It is possible to converge. Moreover, according to the nanofiber manufacturing method which concerns on the modification 2, the effect that it becomes possible to reduce the frequency of changing the feed rate V can also be acquired.

[Example 2]

FIG. 10: is a figure which shows the structure of the air permeability measurement part 41a in Example 2. As shown in FIG. Fig. 10 (a) is a diagram showing the configuration of the air permeability measuring unit 41a, and Fig. 10 (b) shows the air permeability measuring unit 41 adding and recording a trajectory for tying a portion where the air permeability is measured on the long sheet W. will be.

Although the nanofiber manufacturing method (2) (not shown) which concerns on Example 2 has the structure similarly to the nanofiber manufacturing apparatus 1 which concerns on Example 1, the structure of the air permeability measuring apparatus is Example 1 It differs from the case of the nanofiber manufacturing apparatus 1 which concerns on this. That is, in the nanofiber manufacturing apparatus 2 which concerns on Example 2, as shown in FIG. 10, the air permeability measuring apparatus 40a (not shown) measures the air permeability P of the elongate sheet W as shown in FIG. As the measurement unit, three air passages disposed at a plurality of positions (center part, left end part, and right end part in the width direction of the long sheet) in the width direction of the long sheet W are provided with the measuring unit 41a.

As described above, the nanofiber production apparatus 2 according to the second embodiment is different from the case of the nanofiber production apparatus 1 according to the first embodiment, although the configuration of the air permeability measuring device is different. The air permeability measuring device 40a for measuring the air permeability P of the deposited long sheet W and the air permeation rate P based on the air permeability P measured by the air permeability measuring device 40a. Since the speed control apparatus 50 is provided, it becomes possible to control the conveyance speed based on the ventilation degree measured by the ventilation degree measurement apparatus. For this reason, similarly to the case of the nanofiber manufacturing apparatus 1 according to Example 1, even if the air condition varies due to fluctuations in the spinning conditions in the long-term field spinning process, the amount of change in the air permeability is appropriately controlled by controlling the feed rate accordingly. Can be stopped in a predetermined range, and as a result, it becomes possible to mass-produce a nanofiber nonwoven fabric having a uniform air permeability.

Moreover, according to the nanofiber manufacturing method (2) which concerns on Example 2, the air-permeability measurement apparatus 40a is a some air-permeability measurement part arrange | positioned in the several position in the width direction of the elongate sheet W as a air-permeability measurement part. Since 41a is provided, it is possible to measure the air permeability over the wide area of the long sheet in the same width as in the case of the nanofiber manufacturing apparatus 1 according to Example 1, and to control the feed rate more appropriately. It becomes possible.

Moreover, according to the nanofiber manufacturing method (2) which concerns on Example 2, the average air permeability <P> obtained by the feed rate control apparatus 50 averages the air permeability P measured by the some air permeability measurement part 41a. Since the feed rate V is controlled on the basis of the above, similarly to the case of the nanofiber manufacturing apparatus 1 according to Example 1, it is distributed in the air permeability P in the width direction of the long sheet W. In any case, by controlling the feed rate V on the basis of the average ventilation <P>, it becomes possible to control the feed rate more appropriately.

And since the nanofiber manufacturing method (2) which concerns on Example 2 has a structure similar to the case of the nanofiber manufacturing apparatus 1 which concerns on Example 1 except the structure of air permeability, it relates to Example 1 It has a corresponding effect among the effects which the nanofiber manufacturing apparatus 1 has.

As mentioned above, although this invention was demonstrated based on said Example, this invention is not limited to said Example. Various forms can be implemented in the range which does not deviate from the meaning, For example, the following modification is also possible.

(1) In each of the above embodiments, the nanofiber production apparatus of the present invention has been described by using a nanofiber production apparatus having four field emission values as an electric field radiator, but the present invention is not limited thereto. For example, the present invention can be applied to a nanofiber manufacturing apparatus having one to three or five or more field emission values. In addition, the present invention can be applied to a nanofiber production apparatus using a melt blow spinning device in place of the field spinning value. In addition, the nanofiber manufacturing apparatus of the present invention, using a melt blown spinning device, a spanbond spinning device, a needle punch spinning device and other spinning equipment to produce a nonwoven fabric on a long sheet, and further deposited a nanofiber sheet It can also be used appropriately to control the feedrate based on the ventilation of

(2) In each said embodiment, although the nanofiber manufacturing apparatus of this invention was demonstrated using the upward field emission value which has an upward nozzle, this invention is not limited to this. For example, the present invention can be applied to a top-down field emission device having a downward nozzle or a nanofiber production device having a side field emission device having a side nozzle.

(3) In each of the above embodiments, the positive electrode of the power supply device 160 is connected to the collector 150, and the negative electrode of the power supply device 160 is connected to the nozzle block 110. Although the nanofiber manufacturing apparatus was demonstrated, this invention is not limited to this. For example, the present invention can be applied to a nanofiber production apparatus having an electric field emission value in which a positive electrode of a power supply device is connected to a nozzle and a negative electrode of the power supply device is connected to a collector.

(4) The nanofiber manufacturing apparatus of the present invention is not very uniform, of course, in the case of mass-producing a non-woven fabric having a more uniform air permeability by depositing a nanofiber having a uniform air permeability on a long sheet having a uniform air permeability. By depositing nanofibers with the air permeability according to the long sheet having the air permeability, it can be suitably used even when mass-producing a nanofiber nonwoven fabric having a uniform air permeability as a whole.

(5) In the above embodiment, the present invention has been described using a nanofiber production apparatus in which one nozzle block is disposed in one field radiating device, but the present invention is not limited thereto. It is an enlarged view of the main part of the field radiator 20a. For example, as shown in FIG. 11, the present invention can be applied to a nanofiber manufacturing apparatus in which two nozzle blocks 110a1 and 110a2 are disposed in one field radiator 20a, and two or more nozzle blocks. The present invention can also be applied to this excreted nanofiber manufacturing apparatus.

In this case, the nozzle arrangement pitch may be the same with all nozzle blocks, and the nozzle arrangement pitch may be different with each nozzle block. In addition, the height position of the nozzle block may be the same for all the nozzle blocks, or the height position of the nozzle block may be different for each nozzle block.

(6) In the nanofiber manufacturing apparatus of the present invention, a mechanism for reciprocating the nozzle block at a predetermined reciprocating cycle along the width direction of the long sheet may be provided. By using the mechanism, electric field spinning is performed while reciprocating the nozzle block at a predetermined reciprocating cycle, so that the deposition amount of the polymer fibers along the width direction of the long sheet can be made uniform. In this case, the reciprocating cycle and the reciprocating distance of the nozzle block may be controlled independently for each field radiating device or for each nozzle block. With such a configuration, it is possible to reciprocate all the nozzle blocks at the same period, and to reciprocate each nozzle block at different periods. Further, the reciprocating distance of the reciprocating motion may be the same with all the nozzle blocks, or the reciprocating distance of the reciprocating motion with each nozzle block may be different.

1 ... nano-fiber manufacturing apparatus, 10 ... conveying apparatus, 11 ...
12 winding rollers, 13, 18 auxiliary rollers,
14, 15, 16, 17 Drive rollers, 20, 20a ...
30 ... heating devices, 32 ... heaters, 40 ...
41, 41a ... ventilation unit, 42 body unit, 43 driving unit,
43a ... support part, 44 control part, 50 ...
60 ... main control device, 70 VOC processing device, 100 case,
102 ... radiation field, 110, 110a1, 110a2 ...
150 ... collector, 152 ... insulating member, 160 ...
170 ... auxiliary belt device, 172 ...
174 ... Auxiliary belt roller, a ... conveying direction, b ... width direction of long sheet,
P ... ventilation, <P> ..., average ventilation, V, ...
W ... long sheet, ΔP ... deviation

Claims (11)

A conveying apparatus for conveying a long sheet at a predetermined conveying speed,
A spinning device for depositing nanofibers on the long sheet being transported by the transfer device;
An air permeability measuring device for measuring the air permeability of the long sheet in which the nanofibers are deposited by the spinning device;
And a feed rate control device for controlling the feed rate based on the air permeability measured by the air permeability measuring device. The method of claim 1,
The feed rate control device is a nanofiber manufacturing apparatus, characterized in that for controlling the feed rate on the basis of the deviation amount between the air permeability measured by the air permeability measuring device and a predetermined target air permeability. The method of claim 2,
The feed rate control device, the nanofiber manufacturing apparatus, characterized in that for controlling the feed rate in consideration of the time change rate of the deviation. The method according to any one of claims 1 to 3,
The air permeability measuring device includes a air permeability measuring device for measuring the air permeability of the long sheet, and a nanofiber manufacturing apparatus, characterized in that the drive unit for reciprocating the measurement section along a width direction of the long sheet at a predetermined cycle. The method of claim 4, wherein
The transfer speed control device is configured to transfer the air permeability measured by the air permeability measurement device based on an average air permeability obtained by averaging the predetermined period or a time corresponding to n times the period, where n is a natural number. Nanofiber manufacturing apparatus, characterized in that for controlling the speed. The method according to any one of claims 1 to 3,
The air permeability measuring device is a air permeability measuring unit that measures the air permeability of the long sheet, and includes a plurality of air permeability measuring units disposed at a plurality of positions in the width direction of the long sheet. The method according to claim 6,
And the feed rate control device controls the feed rate based on an average air permeability obtained by averaging the air permeability measured by the plurality of air permeability measuring units. 4. The method according to any one of claims 1 to 3,
And a heating device disposed between the radiating device and the air permeability measuring device, the heating device heating the long sheet on which the nanofibers are deposited. 4. The method according to any one of claims 1 to 3,
The spinning apparatus is a nanofiber manufacturing apparatus, characterized in that a plurality is arranged in series along the conveying direction of the long sheet. The method of claim 9,
The spinning device is a nanofiber manufacturing apparatus, characterized in that the field spinning device. While the nanofibers are deposited on the long sheet being conveyed at a predetermined feed rate, the air permeability of the long sheet on which the nanofibers are deposited is measured, and the feed rate of the long sheet is controlled based on the measured air permeability of the long sheet. Nanofiber manufacturing method characterized in that.

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